diff --git a/app/src/main/java/com/m57/hermescontrol/HermesControlApp.kt b/app/src/main/java/com/m57/hermescontrol/HermesControlApp.kt
index 5e75e555..b9a33c3e 100644
--- a/app/src/main/java/com/m57/hermescontrol/HermesControlApp.kt
+++ b/app/src/main/java/com/m57/hermescontrol/HermesControlApp.kt
@@ -13,7 +13,6 @@ import com.m57.hermescontrol.data.local.AuthManager
 import com.m57.hermescontrol.data.local.SessionListCacheStore
 import com.m57.hermescontrol.data.remote.NetworkMonitor
 import com.m57.hermescontrol.data.remote.OkHttpProvider
-import com.m57.hermescontrol.data.update.UpdateNoticeManager
 import com.m57.hermescontrol.notification.TurnCorrelationTracker
 import com.m57.hermescontrol.ui.analytics.AnalyticsPreloader
 import kotlinx.coroutines.CoroutineScope
@@ -41,9 +40,6 @@ class HermesControlApp :
             // so the tab renders instantly when opened (the usage endpoint is slow on a
             // cold backend). Fire-and-forget; never blocks UI startup.
             AnalyticsPreloader.preload(this@HermesControlApp)
-            // Issue #890: silent once-per-version update check right after launch,
-            // so the chat screen can show an update banner without user interaction.
-            UpdateNoticeManager.checkOnLaunch()
         }
     }
 
diff --git a/app/src/main/java/com/m57/hermescontrol/MainActivity.kt b/app/src/main/java/com/m57/hermescontrol/MainActivity.kt
index 5523362d..08e3b710 100644
--- a/app/src/main/java/com/m57/hermescontrol/MainActivity.kt
+++ b/app/src/main/java/com/m57/hermescontrol/MainActivity.kt
@@ -19,6 +19,7 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.lifecycleScope
 import androidx.lifecycle.repeatOnLifecycle
 import com.m57.hermescontrol.data.local.AuthManager
+import com.m57.hermescontrol.data.update.UpdateNoticeManager
 import com.m57.hermescontrol.data.ws.HermesWsClient
 import com.m57.hermescontrol.notification.NotificationHelper
 import com.m57.hermescontrol.notification.NotificationReplyReceiver
@@ -26,6 +27,7 @@ import com.m57.hermescontrol.theme.HermesControlTheme
 import com.m57.hermescontrol.ui.common.ErrorState
 import com.m57.hermescontrol.ui.common.LoadingState
 import com.m57.hermescontrol.util.LocaleContextWrapper
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
 
 class MainActivity : ComponentActivity() {
@@ -131,6 +133,10 @@ class MainActivity : ComponentActivity() {
 
     override fun onResume() {
         super.onResume()
+        lifecycleScope.launch {
+            AuthManager.initializationState.first { it == AuthManager.InitializationState.Ready }
+            UpdateNoticeManager.checkOnLaunch()
+        }
         NotificationHelper.setAppForeground(this, true)
         ExternalActivityLifecycleGuard.onHostResumed()
         NotificationHelper.stop(this)
diff --git a/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateCache.kt b/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateCache.kt
index d7331790..c5bef22f 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateCache.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateCache.kt
@@ -21,8 +21,9 @@ object AppUpdateCache {
      * Session-only dismissal of the chat banner. Snapshot-backed so the chat
      * screen recomposes when it flips; dies with the process.
      */
-    var dismissed by mutableStateOf(false)
-        private set
+    private var dismissedTags by mutableStateOf<Set<String>>(emptySet())
+
+    fun isDismissed(tag: String): Boolean = tag in dismissedTags
 
     /** Whether the full-screen / in-place update dialog should be visible. */
     var isDialogVisible by mutableStateOf(false)
@@ -32,8 +33,8 @@ object AppUpdateCache {
         _state.value = state
     }
 
-    fun dismiss() {
-        dismissed = true
+    fun dismiss(tag: String) {
+        dismissedTags = dismissedTags + tag
     }
 
     fun showDialog() {
@@ -46,7 +47,7 @@ object AppUpdateCache {
 
     /** Test hook: clear state and dismissal between tests. */
     internal fun reset() {
-        dismissed = false
+        dismissedTags = emptySet()
         isDialogVisible = false
         _state.value = AppUpdateState.Idle
     }
diff --git a/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateChecker.kt b/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateChecker.kt
index a6887ba3..fb261acd 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateChecker.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateChecker.kt
@@ -2,10 +2,15 @@ package com.m57.hermescontrol.data.update
 
 import com.m57.hermescontrol.data.remote.OkHttpProvider
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.suspendCancellableCoroutine
 import kotlinx.coroutines.withContext
 import kotlinx.serialization.Serializable
+import okhttp3.Call
+import okhttp3.Callback
+import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
 import okhttp3.OkHttpClient
 import okhttp3.Request
+import okhttp3.Response
 import java.io.File
 import java.io.IOException
 
@@ -79,17 +84,28 @@ fun selectLatestUpdate(
     includeReleaseCandidates: Boolean = false,
 ): UpdateInfo? =
     releases
-        .filter { !it.draft && it.apkAsset != null }
-        .filter {
-            if (!it.prerelease) {
-                true
-            } else {
-                includeReleaseCandidates && isReleaseCandidateVersion(it.tagName)
-            }
-        }.reduceOrNull { best, candidate ->
+        .filter(::hasUsableApk)
+        .filter { isEligibleRelease(it, includeReleaseCandidates) }
+        .reduceOrNull { best, candidate ->
             if (isNewerVersion(candidate.tagName, best.tagName)) candidate else best
         }
 
+private fun hasUsableApk(release: UpdateInfo): Boolean =
+    !release.draft && release.apkAsset?.browserDownloadUrl?.toHttpUrlOrNull()?.let {
+        it.scheme == "http" || it.scheme == "https"
+    } == true
+
+private fun isEligibleRelease(
+    release: UpdateInfo,
+    includeReleaseCandidates: Boolean,
+): Boolean {
+    val version = parseVersion(release.tagName) ?: return false
+    val isRc = version.prerelease.firstOrNull()?.let(RC_IDENTIFIER::matches) == true
+    val isStable = version.prerelease.isEmpty() && !release.prerelease
+    if (isStable) return true
+    return includeReleaseCandidates && isRc
+}
+
 private data class ParsedVersion(
     val core: List<Int>,
     val prerelease: List<String>,
@@ -161,17 +177,16 @@ open class AppUpdateChecker(
      */
     open suspend fun fetchLatestRelease(includeReleaseCandidates: Boolean = false): UpdateInfo? =
         withContext(Dispatchers.IO) {
-            if (includeReleaseCandidates) {
-                val body = get("$apiBaseUrl/releases?per_page=$RELEASE_LIST_PAGE_SIZE") ?: return@withContext null
-                selectLatestUpdate(parseReleaseList(body).orEmpty(), includeReleaseCandidates = true)
-            } else {
-                val body = get("$apiBaseUrl/releases/latest") ?: return@withContext null
-                parseUpdateInfo(body)
+            val latest = get("$apiBaseUrl/releases/latest")?.let(::parseRelease)
+            if (!includeReleaseCandidates && latest != null && selectLatestUpdate(listOf(latest)) != null) {
+                return@withContext latest
             }
+            val releases = fetchReleasePages() ?: return@withContext null
+            selectLatestUpdate(releases + listOfNotNull(latest), includeReleaseCandidates)
         }
 
-    /** GET [url] as JSON text, or null on any non-2xx response. */
-    private fun get(url: String): String? {
+    /** GET a GitHub URL. 404 means absent; other HTTP/network failures stay visible. */
+    private fun get(url: String): ReleasePage? {
         val request =
             Request
                 .Builder()
@@ -179,11 +194,45 @@ open class AppUpdateChecker(
                 .header("Accept", "application/vnd.github+json")
                 .build()
         client.newCall(request).execute().use { response ->
-            if (!response.isSuccessful) return null
-            return response.body.string().orEmpty()
+            if (response.code == HTTP_NOT_FOUND) return null
+            if (!response.isSuccessful) throw IOException("GitHub releases request failed (${response.code})")
+            return ReleasePage(response.body.string().orEmpty(), response.nextPageUrl())
         }
     }
 
+    private fun fetchReleasePages(): List<UpdateInfo>? {
+        var nextUrl: String? = "$apiBaseUrl/releases?per_page=$RELEASE_LIST_PAGE_SIZE&page=1"
+        val releases = mutableListOf<UpdateInfo>()
+        while (nextUrl != null) {
+            val page =
+                get(nextUrl)
+                    ?: return if (releases.isEmpty()) null else throw IOException("Incomplete GitHub releases list")
+            val parsed = parseReleaseList(page.body) ?: throw IOException("GitHub returned malformed release metadata")
+            releases += parsed
+            nextUrl = page.nextUrl
+        }
+        return releases
+    }
+
+    private fun parseRelease(page: ReleasePage): UpdateInfo =
+        parseUpdateInfo(page.body) ?: throw IOException("GitHub returned malformed release metadata")
+
+    private fun Response.nextPageUrl(): String? {
+        val link = header("Link") ?: return null
+        val url = NEXT_LINK.find(link)?.groupValues?.get(1) ?: return null
+        val next = url.toHttpUrlOrNull() ?: throw IOException("GitHub returned an invalid pagination URL")
+        val base = apiBaseUrl.toHttpUrlOrNull() ?: throw IOException("Invalid GitHub API base URL")
+        if (next.host != base.host || next.encodedPath != base.encodedPath.trimEnd('/') + "/releases") {
+            throw IOException("GitHub returned an untrusted pagination URL")
+        }
+        return next.toString()
+    }
+
+    private data class ReleasePage(
+        val body: String,
+        val nextUrl: String?,
+    )
+
     /**
      * Stream a release APK asset to [dest], reporting progress 0..1 via
      * [onProgress]. True on success; false (with the partial file deleted)
@@ -194,41 +243,103 @@ open class AppUpdateChecker(
         dest: File,
         onProgress: (Float) -> Unit,
     ): Boolean =
-        withContext(Dispatchers.IO) {
-            val request = Request.Builder().url(url).build()
-            try {
-                client.newCall(request).execute().use { response ->
-                    if (!response.isSuccessful) return@withContext false
-                    val body = response.body
-                    val total = body.contentLength()
-                    dest.outputStream().use { out ->
-                        val buffer = ByteArray(DEFAULT_BUFFER_SIZE)
-                        var read = 0L
-                        body.byteStream().use { input ->
-                            while (true) {
-                                val n = input.read(buffer)
-                                if (n == -1) break
-                                out.write(buffer, 0, n)
-                                read += n
-                                if (total > 0) {
-                                    onProgress((read.toFloat() / total.toFloat()).coerceIn(0f, 1f))
+        suspendCancellableCoroutine { continuation ->
+            val request =
+                try {
+                    val httpUrl =
+                        url.toHttpUrlOrNull()?.takeIf { it.scheme == "http" || it.scheme == "https" }
+                            ?: run {
+                                failDownload(continuation, dest)
+                                return@suspendCancellableCoroutine
+                            }
+                    Request.Builder().url(httpUrl).build()
+                } catch (_: IllegalArgumentException) {
+                    failDownload(continuation, dest)
+                    return@suspendCancellableCoroutine
+                }
+            val call =
+                try {
+                    client.newCall(request)
+                } catch (_: Exception) {
+                    failDownload(continuation, dest)
+                    return@suspendCancellableCoroutine
+                }
+            continuation.invokeOnCancellation {
+                call.cancel()
+                deletePartial(dest)
+            }
+            val callback =
+                object : Callback {
+                    override fun onFailure(
+                        call: Call,
+                        e: IOException,
+                    ) {
+                        failDownload(continuation, dest)
+                    }
+
+                    override fun onResponse(
+                        call: Call,
+                        response: Response,
+                    ) {
+                        var succeeded = false
+                        try {
+                            response.use {
+                                if (response.isSuccessful) {
+                                    val body = response.body
+                                    val total = body.contentLength()
+                                    dest.outputStream().use { out ->
+                                        val buffer = ByteArray(DEFAULT_BUFFER_SIZE)
+                                        var read = 0L
+                                        body.byteStream().use { input ->
+                                            while (true) {
+                                                val n = input.read(buffer)
+                                                if (n == -1) break
+                                                out.write(buffer, 0, n)
+                                                read += n
+                                                if (total > 0) {
+                                                    onProgress((read.toFloat() / total.toFloat()).coerceIn(0f, 1f))
+                                                }
+                                            }
+                                        }
+                                    }
+                                    succeeded = true
                                 }
                             }
+                        } catch (_: Exception) {
+                            // Includes response/body close failures; never report success before close.
+                        }
+                        if (succeeded) {
+                            if (continuation.isActive) continuation.resume(true) { _, _, _ -> }
+                        } else {
+                            failDownload(continuation, dest)
                         }
                     }
-                    true
                 }
-            } catch (e: Exception) {
-                dest.delete()
-                false
+            try {
+                call.enqueue(callback)
+            } catch (_: Exception) {
+                failDownload(continuation, dest)
             }
         }
 
+    private fun failDownload(
+        continuation: kotlinx.coroutines.CancellableContinuation<Boolean>,
+        dest: File,
+    ) {
+        deletePartial(dest)
+        if (continuation.isActive) continuation.resume(false) { _, _, _ -> }
+    }
+
+    private fun deletePartial(dest: File) {
+        runCatching { dest.delete() }
+    }
+
     private companion object {
         const val DEFAULT_BUFFER_SIZE = 8192
+        const val HTTP_NOT_FOUND = 404
 
-        /** How many recent releases the opt-in RC scan inspects. */
-        const val RELEASE_LIST_PAGE_SIZE = 20
+        const val RELEASE_LIST_PAGE_SIZE = 100
+        val NEXT_LINK = Regex("<([^>]+)>;\\s*rel=\"next\"")
     }
 }
 
diff --git a/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateState.kt b/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateState.kt
index 49b3bd4c..bf19a1c7 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateState.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/update/AppUpdateState.kt
@@ -40,6 +40,7 @@ sealed interface AppUpdateState {
 
     data class Error(
         val message: String,
+        val isCheckError: Boolean = false,
     ) : AppUpdateState
 }
 
diff --git a/app/src/main/java/com/m57/hermescontrol/data/update/UpdateNoticeManager.kt b/app/src/main/java/com/m57/hermescontrol/data/update/UpdateNoticeManager.kt
index b4ae9020..9047cd37 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/update/UpdateNoticeManager.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/update/UpdateNoticeManager.kt
@@ -6,23 +6,31 @@ import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.currentCoroutineContext
+import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import java.io.IOException
 
 /**
- * Startup update check (issue #890): one silent GitHub ping per installed
- * version, fired right after launch, so the chat screen can show an update
- * banner without the user ever opening the About tab.
+ * Shared release check (issue #890): checks after launch and on foreground
+ * return, with a short process-local debounce so the chat screen can show an
+ * update banner without the user ever opening the About tab.
  *
  * The result lands in [AppUpdateCache] (consumed by the chat banner and
  * adopted by the About tab) and the latest tag is persisted via
  * [AuthManager.setLastKnownLatestTag] so a dismissed banner can return on a
- * later launch. Failures leave the cache Idle — the About tab still has its
- * own manual retry path.
+ * later launch. Failed checks remain visible and can be retried from the About
+ * tab or dialog without persisting a false successful-check marker.
  */
 object UpdateNoticeManager {
     private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+    private val checkLock = Any()
+    private var activeCheck: Job? = null
+    private var lastSuccessfulCheckAt: Long? = null
+    private var lastFailedCheckAt: Long? = null
+    private var channelGeneration = 0
 
     /**
      * Release-only feature (issue #890): the launch check and chat banner are
@@ -32,57 +40,153 @@ object UpdateNoticeManager {
     var enabled: Boolean = !BuildConfig.DEBUG
         internal set
 
-    /** Release check interval (24 hours). */
-    const val CHECK_INTERVAL_MS: Long = 24 * 60 * 60 * 1000L
+    /** Avoid duplicate foreground checks in one process; a cold launch always rechecks. */
+    const val CHECK_INTERVAL_MS: Long = 5 * 60 * 1000L
+    const val FAILURE_BACKOFF_MS: Long = 30 * 1000L
 
-    /** Run from Application.onCreate, after AuthManager.init. Checks at most once every 24h. */
+    /** Run after preferences are ready; failed checks never suppress the next foreground retry. */
     fun checkOnLaunch(
         checker: AppUpdateChecker = AppUpdateChecker(),
         currentVersion: String = BuildConfig.VERSION_NAME,
         ioDispatcher: CoroutineDispatcher = Dispatchers.IO,
         now: Long = System.currentTimeMillis(),
+        force: Boolean = false,
     ) {
-        if (!enabled) return
-        val lastCheck = AuthManager.getLastUpdateCheckTimestamp()
-        val versionChanged = AuthManager.getUpdateCheckDoneForVersion() != currentVersion
-        if (!versionChanged && (now - lastCheck < CHECK_INTERVAL_MS)) return
-
-        // Captured once so the check and the notice path agree on the channel.
-        val includeReleaseCandidates = AuthManager.isCheckingReleaseCandidateUpdates()
-
-        scope.launch(ioDispatcher) {
-            AuthManager.setUpdateCheckDoneForVersion(currentVersion)
-            AuthManager.setLastUpdateCheckTimestamp(now)
-            val result =
-                try {
-                    checker.fetchLatestRelease(includeReleaseCandidates)
-                } catch (e: CancellationException) {
-                    throw e
-                } catch (e: IOException) {
-                    return@launch
-                } catch (e: Exception) {
-                    return@launch
-                }
-            val info = result ?: return@launch
-            // The user may have switched back to stable while this request was in
-            // flight — an RC result must never be published on the stable channel.
-            if (isReleaseCandidateVersion(info.tagName) && !AuthManager.isCheckingReleaseCandidateUpdates()) {
-                return@launch
+        if (!enabled && !force) return
+        synchronized(checkLock) {
+            if (activeCheck?.isActive == true) return
+            if (!force && lastSuccessfulCheckAt?.let { now - it < CHECK_INTERVAL_MS } == true) return
+            if (!force && lastFailedCheckAt?.let { now - it < FAILURE_BACKOFF_MS } == true) return
+            val includeReleaseCandidates = AuthManager.isCheckingReleaseCandidateUpdates()
+            val generation = channelGeneration
+            val previousState = AppUpdateCache.state.value
+            if (force ||
+                previousState !is AppUpdateState.UpdateAvailable
+            ) {
+                AppUpdateCache.update(AppUpdateState.Checking)
             }
-            val apk = info.apkAsset ?: return@launch
-            val state =
-                if (isNewerVersion(info.tagName, currentVersion)) {
-                    AppUpdateState.UpdateAvailable(
-                        latestTag = info.tagName,
-                        apkUrl = apk.browserDownloadUrl,
-                        sizeBytes = apk.size,
-                        releaseNotes = info.body,
-                    )
-                } else {
-                    AppUpdateState.UpToDate(latestTag = info.tagName)
+            activeCheck =
+                scope.launch(ioDispatcher) {
+                    val thisJob = currentCoroutineContext()[Job]
+                    var successful = false
+                    var failed = false
+                    try {
+                        val info = checker.fetchLatestRelease(includeReleaseCandidates)
+                        val apk = info?.apkAsset
+                        val state =
+                            if (info == null) {
+                                AppUpdateState.Error(NO_RELEASE_ERROR, isCheckError = true)
+                            } else if (apk == null) {
+                                AppUpdateState.Error(NO_APK_ERROR, isCheckError = true)
+                            } else if (isNewerVersion(info.tagName, currentVersion)) {
+                                AppUpdateState.UpdateAvailable(
+                                    latestTag = info.tagName,
+                                    apkUrl = apk.browserDownloadUrl,
+                                    sizeBytes = apk.size,
+                                    releaseNotes = info.body,
+                                )
+                            } else {
+                                AppUpdateState.UpToDate(latestTag = info.tagName)
+                            }
+                        var resultRejected = false
+                        synchronized(checkLock) {
+                            if (activeCheck !== thisJob || generation != channelGeneration) return@synchronized
+                            val currentChannel = AuthManager.isCheckingReleaseCandidateUpdates()
+                            if (includeReleaseCandidates != currentChannel ||
+                                (info != null && isReleaseCandidateVersion(info.tagName) && !currentChannel)
+                            ) {
+                                if (AppUpdateCache.state.value is AppUpdateState.Checking) {
+                                    AppUpdateCache.update(previousState)
+                                }
+                                resultRejected = true
+                                return@synchronized
+                            }
+                            AppUpdateCache.update(state)
+                            if (state is AppUpdateState.UpdateAvailable || state is AppUpdateState.UpToDate) {
+                                state.releaseTag()?.let { AuthManager.setLastKnownLatestTag(it) }
+                                AuthManager.setUpdateCheckDoneForVersion(currentVersion)
+                                AuthManager.setLastUpdateCheckTimestamp(System.currentTimeMillis())
+                                successful = true
+                            } else {
+                                failed = true
+                            }
+                        }
+                        if (resultRejected) return@launch
+                    } catch (e: CancellationException) {
+                        throw e
+                    } catch (e: IOException) {
+                        synchronized(checkLock) {
+                            if (activeCheck === thisJob && generation == channelGeneration) {
+                                failed = true
+                                if (AppUpdateCache.state.value is AppUpdateState.Checking) {
+                                    AppUpdateCache.update(AppUpdateState.Error(NETWORK_ERROR, isCheckError = true))
+                                }
+                            }
+                        }
+                    } catch (e: Exception) {
+                        synchronized(checkLock) {
+                            if (activeCheck === thisJob && generation == channelGeneration) {
+                                failed = true
+                                if (AppUpdateCache.state.value is AppUpdateState.Checking) {
+                                    AppUpdateCache.update(
+                                        AppUpdateState.Error(GENERIC_CHECK_ERROR, isCheckError = true),
+                                    )
+                                }
+                            }
+                        }
+                    } finally {
+                        synchronized(checkLock) {
+                            if (activeCheck === thisJob) {
+                                if (successful) lastSuccessfulCheckAt = now
+                                if (failed) lastFailedCheckAt = now
+                                activeCheck = null
+                            }
+                        }
+                    }
                 }
-            AppUpdateCache.update(state)
-            state.releaseTag()?.let { AuthManager.setLastKnownLatestTag(it) }
+        }
+    }
+
+    private const val NETWORK_ERROR = "Network error — check your connection"
+    private const val GENERIC_CHECK_ERROR = "Couldn't check for updates"
+    private const val NO_RELEASE_ERROR = "No release found yet"
+    private const val NO_APK_ERROR = "Release has no APK asset"
+
+    /** Explicit check action; shares in-flight work but bypasses the local debounce. */
+    fun checkNow(
+        checker: AppUpdateChecker,
+        currentVersion: String,
+        ioDispatcher: CoroutineDispatcher,
+    ) {
+        checkOnLaunch(checker, currentVersion, ioDispatcher, force = true)
+    }
+
+    /** Persist the channel choice and invalidate in-flight checks as one operation. */
+    fun channelChanged(enabled: Boolean) {
+        synchronized(checkLock) {
+            AuthManager.setCheckReleaseCandidateUpdates(enabled)
+            channelGeneration++
+            if (AppUpdateCache.state.value is AppUpdateState.Checking) {
+                AppUpdateCache.update(AppUpdateState.Idle)
+            }
+            activeCheck?.cancel()
+            activeCheck = null
+            lastSuccessfulCheckAt = null
+            lastFailedCheckAt = null
+        }
+    }
+
+    /** Test hook: reset process-local admission state between tests. */
+    internal fun resetForTests() {
+        synchronized(checkLock) {
+            activeCheck?.cancel()
+            activeCheck = null
+            if (AppUpdateCache.state.value is AppUpdateState.Checking) {
+                AppUpdateCache.update(AppUpdateState.Idle)
+            }
+            lastSuccessfulCheckAt = null
+            lastFailedCheckAt = null
+            channelGeneration++
         }
     }
 
@@ -94,12 +198,9 @@ object UpdateNoticeManager {
     fun noticeTag(currentVersion: String = BuildConfig.VERSION_NAME): String? {
         if (!enabled) return null
         val dismissed = AuthManager.getDismissedUpdateTag()
-        val candidateTag =
-            (AppUpdateCache.state.value as? AppUpdateState.UpdateAvailable)?.latestTag
-                ?: AuthManager.getLastKnownLatestTag()
-                ?: return null
+        val candidateTag = (AppUpdateCache.state.value as? AppUpdateState.UpdateAvailable)?.latestTag ?: return null
 
-        if (candidateTag == dismissed) return null
+        if (candidateTag == dismissed || AppUpdateCache.isDismissed(candidateTag)) return null
         if (isReleaseCandidateVersion(candidateTag) && !AuthManager.isCheckingReleaseCandidateUpdates()) {
             return null
         }
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatAppUpdateSection.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatAppUpdateSection.kt
index 2ec2e26b..c05fd7d0 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatAppUpdateSection.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatAppUpdateSection.kt
@@ -7,6 +7,7 @@ import android.provider.Settings
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.rememberUpdatedState
 import androidx.compose.ui.platform.LocalContext
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
@@ -17,6 +18,7 @@ import androidx.lifecycle.viewmodel.compose.viewModel
 import com.m57.hermescontrol.data.update.AppUpdateCache
 import com.m57.hermescontrol.data.update.AppUpdateState
 import com.m57.hermescontrol.data.update.UpdateNoticeManager
+import com.m57.hermescontrol.data.update.releaseTag
 import com.m57.hermescontrol.ui.common.AppUpdateDialog
 import com.m57.hermescontrol.ui.common.UpdateNoticeBanner
 import com.m57.hermescontrol.ui.settings.AppUpdateViewModel
@@ -32,14 +34,17 @@ fun ChatAppUpdateSection() {
             AppUpdateViewModel(app)
         }
     val appUpdateState by appUpdateViewModel.state.collectAsStateWithLifecycle()
+    val currentAppUpdateState by rememberUpdatedState(appUpdateState)
 
     val updateLifecycleOwner = LocalLifecycleOwner.current
     DisposableEffect(updateLifecycleOwner) {
         val observer =
             LifecycleEventObserver { _, event ->
                 if (event == Lifecycle.Event.ON_RESUME) {
-                    if (appUpdateState is AppUpdateState.NeedsUnknownSourcesPermission) {
+                    if (currentAppUpdateState is AppUpdateState.NeedsUnknownSourcesPermission) {
                         appUpdateViewModel.resumeInstallAfterPermission()
+                    } else {
+                        appUpdateViewModel.reconcileInstallerReturn()
                     }
                 }
             }
@@ -49,15 +54,13 @@ fun ChatAppUpdateSection() {
         }
     }
 
-    if (UpdateNoticeManager.enabled && !AppUpdateCache.dismissed) {
-        val noticeTag =
-            (updateNotice as? AppUpdateState.UpdateAvailable)?.latestTag
-                ?: UpdateNoticeManager.noticeTag()
+    if (UpdateNoticeManager.enabled) {
+        val noticeTag = UpdateNoticeManager.noticeTag()
         if (noticeTag != null) {
             UpdateNoticeBanner(
                 latestTag = noticeTag,
                 onUpdate = { AppUpdateCache.showDialog() },
-                onDismiss = { AppUpdateCache.dismiss() },
+                onDismiss = { AppUpdateCache.dismiss(noticeTag) },
             )
         }
     }
@@ -73,12 +76,17 @@ fun ChatAppUpdateSection() {
         AppUpdateDialog(
             state = dialogState,
             onDismiss = { AppUpdateCache.hideDialog() },
+            onLater = {
+                dialogState.releaseTag()?.let(AppUpdateCache::dismiss)
+                AppUpdateCache.hideDialog()
+            },
             onStartUpdate = { appUpdateViewModel.startUpdate() },
             onCancelDownload = { appUpdateViewModel.cancelDownload() },
             onNeverAskAgain = { appUpdateViewModel.dismissCurrentUpdate() },
             onOpenSettings = {
                 launchUnknownAppSourcesSettings(context)
             },
+            onCheckUpdate = { appUpdateViewModel.checkForUpdate() },
         )
     }
 }
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/common/AppUpdateDialog.kt b/app/src/main/java/com/m57/hermescontrol/ui/common/AppUpdateDialog.kt
index e69c0c21..5106ff4e 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/common/AppUpdateDialog.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/common/AppUpdateDialog.kt
@@ -48,10 +48,12 @@ import com.m57.hermescontrol.data.update.releaseTag
 fun AppUpdateDialog(
     state: AppUpdateState,
     onDismiss: () -> Unit,
+    onLater: () -> Unit = onDismiss,
     onStartUpdate: () -> Unit,
     onCancelDownload: () -> Unit,
     onNeverAskAgain: () -> Unit,
     onOpenSettings: () -> Unit,
+    onCheckUpdate: () -> Unit = {},
 ) {
     val available = state as? AppUpdateState.UpdateAvailable
     var cachedAvailable by remember { mutableStateOf(available) }
@@ -160,6 +162,26 @@ fun AppUpdateDialog(
 
                 // Progress / Action States
                 when (state) {
+                    AppUpdateState.Checking -> {
+                        Column(modifier = Modifier.fillMaxWidth()) {
+                            Text(
+                                text = stringResource(R.string.settings_about_update_checking),
+                                style = MaterialTheme.typography.bodySmall,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            )
+                            Spacer(modifier = Modifier.height(8.dp))
+                            LinearProgressIndicator(modifier = Modifier.fillMaxWidth())
+                        }
+                    }
+
+                    is AppUpdateState.UpToDate -> {
+                        Text(
+                            text = stringResource(R.string.settings_about_update_uptodate, state.latestTag),
+                            style = MaterialTheme.typography.bodyMedium,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                    }
+
                     is AppUpdateState.Downloading -> {
                         Column(modifier = Modifier.fillMaxWidth()) {
                             Row(
@@ -260,7 +282,7 @@ fun AppUpdateDialog(
                             )
                             Spacer(modifier = Modifier.height(8.dp))
                             Button(
-                                onClick = onStartUpdate,
+                                onClick = if (state.isCheckError) onCheckUpdate else onStartUpdate,
                                 modifier = Modifier.fillMaxWidth(),
                             ) {
                                 Text(stringResource(R.string.settings_about_update_retry))
@@ -268,8 +290,7 @@ fun AppUpdateDialog(
                         }
                     }
 
-                    else -> {
-                        // UpdateAvailable or Idle
+                    is AppUpdateState.UpdateAvailable -> {
                         Column(modifier = Modifier.fillMaxWidth()) {
                             Button(
                                 onClick = onStartUpdate,
@@ -291,7 +312,7 @@ fun AppUpdateDialog(
                                 modifier = Modifier.fillMaxWidth(),
                                 horizontalArrangement = Arrangement.SpaceBetween,
                             ) {
-                                TextButton(onClick = onDismiss) {
+                                TextButton(onClick = onLater) {
                                     Text(stringResource(R.string.update_dialog_action_later))
                                 }
                                 TextButton(onClick = onNeverAskAgain) {
@@ -303,6 +324,12 @@ fun AppUpdateDialog(
                             }
                         }
                     }
+
+                    AppUpdateState.Idle -> {
+                        Button(onClick = onCheckUpdate, modifier = Modifier.fillMaxWidth()) {
+                            Text(stringResource(R.string.settings_about_update_check))
+                        }
+                    }
                 }
             }
         }
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/settings/AppUpdateViewModel.kt b/app/src/main/java/com/m57/hermescontrol/ui/settings/AppUpdateViewModel.kt
index b02aa97b..d7cf2d45 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/settings/AppUpdateViewModel.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/settings/AppUpdateViewModel.kt
@@ -11,19 +11,19 @@ import com.m57.hermescontrol.data.local.AuthManager
 import com.m57.hermescontrol.data.update.AppUpdateCache
 import com.m57.hermescontrol.data.update.AppUpdateChecker
 import com.m57.hermescontrol.data.update.AppUpdateState
-import com.m57.hermescontrol.data.update.isNewerVersion
+import com.m57.hermescontrol.data.update.UpdateNoticeManager
 import com.m57.hermescontrol.data.update.isReleaseCandidateVersion
 import com.m57.hermescontrol.data.update.releaseTag
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.ensureActive
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.launch
 import java.io.File
-import java.io.IOException
+import java.util.UUID
 
 /**
  * Drives the in-app self-update flow (issue #867): check the GitHub
@@ -31,9 +31,8 @@ import java.io.IOException
  * installer. The installer launch uses the application context
  * (FLAG_ACTIVITY_NEW_TASK), so no Activity is required.
  *
- * A silent check runs once per installed version (guarded by the
- * `updateCheckDoneForVersion` app pref) — that's what puts the "Update
- * available" badge on the About row without the user tapping anything.
+ * The ViewModel adopts the process-shared launch/foreground check result, while
+ * manual checks, downloads, and system-installer handoff stay screen-owned.
  */
 class AppUpdateViewModel(
     application: Application,
@@ -51,16 +50,11 @@ class AppUpdateViewModel(
     /** Whether the RC update channel is enabled (issue: RC update toggle). */
     val checkReleaseCandidateUpdates: StateFlow<Boolean> = _checkReleaseCandidateUpdates.asStateFlow()
 
-    private var checkJob: kotlinx.coroutines.Job? = null
     private var downloadJob: kotlinx.coroutines.Job? = null
     private var lastAvailable: AppUpdateState.UpdateAvailable? = null
-
-    /**
-     * Bumped by every check. The blocking OkHttp call underneath cannot be
-     * interrupted, so a cancelled check may still be running; results are only
-     * published when this token is unchanged (and the channel still matches).
-     */
-    private var checkGeneration = 0
+    private var downloadGeneration = 0
+    private var downloadPartialFile: File? = null
+    private var installerReturnPending = false
 
     init {
         val cached = AppUpdateCache.state.value
@@ -70,13 +64,25 @@ class AppUpdateViewModel(
             !_checkReleaseCandidateUpdates.value &&
                 cached.releaseTag()?.let(::isReleaseCandidateVersion) == true
         if (blocked) AppUpdateCache.reset()
+        viewModelScope.launch {
+            AppUpdateCache.state.collect { sharedState ->
+                if (_state.value !is AppUpdateState.Downloading &&
+                    _state.value !is AppUpdateState.Installing &&
+                    _state.value !is AppUpdateState.NeedsUnknownSourcesPermission
+                ) {
+                    _state.value = sharedState
+                    if (sharedState is AppUpdateState.UpdateAvailable) lastAvailable = sharedState
+                }
+            }
+        }
         if (cached is AppUpdateState.UpdateAvailable && !blocked) {
             lastAvailable = cached
             _state.value = cached
         } else if (cached is AppUpdateState.UpToDate && !blocked) {
             _state.value = cached
         } else {
-            checkForUpdate()
+            _state.value = cached
+            UpdateNoticeManager.checkOnLaunch(checker, currentVersion, ioDispatcher)
         }
     }
 
@@ -94,92 +100,20 @@ class AppUpdateViewModel(
      */
     fun setCheckReleaseCandidateUpdates(enabled: Boolean) {
         if (_checkReleaseCandidateUpdates.value == enabled) return
-        AuthManager.setCheckReleaseCandidateUpdates(enabled)
+        UpdateNoticeManager.channelChanged(enabled)
         _checkReleaseCandidateUpdates.value = enabled
         if (!enabled) {
+            if (lastAvailable?.latestTag?.let(::isReleaseCandidateVersion) == true) cancelDownload()
             lastAvailable = null
             AppUpdateCache.reset()
         }
-        // A check already in flight captured the previous channel — cancel it and
-        // bump the generation so a late result can never be published.
-        checkJob?.cancel()
         runCheck()
     }
 
     private fun runCheck() {
-        val generation = ++checkGeneration
-        val includeReleaseCandidates = _checkReleaseCandidateUpdates.value
-        _state.value = AppUpdateState.Checking
-        checkJob =
-            viewModelScope.launch(ioDispatcher) {
-                val now = System.currentTimeMillis()
-                AuthManager.setUpdateCheckDoneForVersion(currentVersion)
-                AuthManager.setLastUpdateCheckTimestamp(now)
-                val result =
-                    try {
-                        checker.fetchLatestRelease(includeReleaseCandidates)
-                    } catch (e: CancellationException) {
-                        // Cancellation is control flow — it must never be reported
-                        // as a failed check.
-                        throw e
-                    } catch (e: IOException) {
-                        if (isCurrentCheck(generation, includeReleaseCandidates)) {
-                            _state.value = AppUpdateState.Error(NETWORK_ERROR)
-                        }
-                        return@launch
-                    } catch (e: Exception) {
-                        if (isCurrentCheck(generation, includeReleaseCandidates)) {
-                            _state.value = AppUpdateState.Error(GENERIC_CHECK_ERROR)
-                        }
-                        return@launch
-                    }
-
-                // The OkHttp call underneath blocks and cannot be interrupted, so a
-                // newer check — or a channel switch — may have happened while it ran.
-                ensureActive()
-                if (!isCurrentCheck(generation, includeReleaseCandidates)) return@launch
-
-                val info =
-                    result ?: run {
-                        _state.value = AppUpdateState.Error(NO_RELEASE_ERROR)
-                        return@launch
-                    }
-                val apk =
-                    info.apkAsset ?: run {
-                        _state.value = AppUpdateState.Error(NO_APK_ERROR)
-                        return@launch
-                    }
-                val state =
-                    if (isNewerVersion(info.tagName, currentVersion)) {
-                        AppUpdateState.UpdateAvailable(
-                            latestTag = info.tagName,
-                            apkUrl = apk.browserDownloadUrl,
-                            sizeBytes = apk.size,
-                            releaseNotes = info.body,
-                        )
-                    } else {
-                        AppUpdateState.UpToDate(latestTag = info.tagName)
-                    }
-                // Fail closed: a release-candidate result is never published once
-                // the RC channel is off, however it reached this point.
-                if (!isAdmissibleOnCurrentChannel(state.releaseTag())) return@launch
-                if (state is AppUpdateState.UpdateAvailable) lastAvailable = state
-                _state.value = state
-                // Keep the launch notice (issue #890) in sync with manual checks.
-                AppUpdateCache.update(state)
-                state.releaseTag()?.let { AuthManager.setLastKnownLatestTag(it) }
-            }
+        UpdateNoticeManager.checkNow(checker, currentVersion, ioDispatcher)
     }
 
-    /**
-     * True when [generation] is still the newest check *and* the channel that
-     * check was started for is still the selected one.
-     */
-    private fun isCurrentCheck(
-        generation: Int,
-        includeReleaseCandidates: Boolean,
-    ): Boolean = generation == checkGeneration && includeReleaseCandidates == _checkReleaseCandidateUpdates.value
-
     /** A release-candidate tag may only be used while the RC channel is on. */
     private fun isAdmissibleOnCurrentChannel(tag: String?): Boolean =
         tag == null || !isReleaseCandidateVersion(tag) || _checkReleaseCandidateUpdates.value
@@ -208,36 +142,70 @@ class AppUpdateViewModel(
 
     /** Download the release APK and launch the system installer. */
     fun startUpdate() {
+        if (_state.value is AppUpdateState.Downloading || _state.value is AppUpdateState.Installing) return
         val available = updateAvailableForInstall() ?: return
         lastAvailable = available
         if (!canRequestInstalls()) {
             _state.value = AppUpdateState.NeedsUnknownSourcesPermission
             return
         }
-        val dest = File(getApplication<Application>().cacheDir, APK_FILE_NAME)
-        _state.value = AppUpdateState.Downloading(0f)
-        downloadJob?.cancel()
-        downloadJob =
-            viewModelScope.launch(ioDispatcher) {
-                val downloaded =
-                    checker.downloadApk(available.apkUrl, dest) { progress ->
-                        _state.value = AppUpdateState.Downloading(progress)
+        val dest = updateApkFile(available.latestTag)
+        val generation = ++downloadGeneration
+        val partial = File(dest.parentFile, "${dest.name}.${UUID.randomUUID()}.$generation.part")
+        downloadPartialFile = partial
+        try {
+            partial.delete()
+            _state.value = AppUpdateState.Downloading(0f)
+            downloadJob?.cancel()
+            downloadJob =
+                viewModelScope.launch(ioDispatcher) {
+                    try {
+                        val downloaded =
+                            checker.downloadApk(available.apkUrl, partial) { progress ->
+                                if (generation ==
+                                    downloadGeneration
+                                ) {
+                                    _state.value = AppUpdateState.Downloading(progress)
+                                }
+                            }
+                        if (generation != downloadGeneration) return@launch
+                        if (!downloaded || !partial.exists() || partial.length() == 0L) {
+                            _state.value = AppUpdateState.Error(DOWNLOAD_ERROR)
+                            return@launch
+                        }
+                        if ((dest.exists() && !dest.delete()) || !partial.renameTo(dest)) {
+                            _state.value = AppUpdateState.Error(DOWNLOAD_ERROR)
+                            return@launch
+                        }
+                        _state.value = AppUpdateState.Installing(available.latestTag)
+                        launchInstaller(dest)
+                    } catch (e: CancellationException) {
+                        throw e
+                    } catch (_: Exception) {
+                        if (generation == downloadGeneration) _state.value = AppUpdateState.Error(DOWNLOAD_ERROR)
+                    } finally {
+                        if (generation == downloadGeneration) {
+                            partial.delete()
+                            downloadPartialFile = null
+                        }
                     }
-                if (!downloaded) {
-                    if (downloadJob?.isCancelled != true) {
-                        _state.value = AppUpdateState.Error(DOWNLOAD_ERROR)
-                    }
-                    return@launch
                 }
-                _state.value = AppUpdateState.Installing(available.latestTag)
-                launchInstaller(dest)
+        } catch (_: Exception) {
+            if (generation == downloadGeneration) {
+                partial.delete()
+                downloadPartialFile = null
+                _state.value = AppUpdateState.Error(DOWNLOAD_ERROR)
             }
+        }
     }
 
     /** Cancel in-flight download and return to UpdateAvailable. */
     fun cancelDownload() {
+        downloadGeneration++
         downloadJob?.cancel()
         downloadJob = null
+        downloadPartialFile?.delete()
+        downloadPartialFile = null
         val available =
             lastAvailable
                 ?: (AppUpdateCache.state.value as? AppUpdateState.UpdateAvailable)
@@ -257,16 +225,15 @@ class AppUpdateViewModel(
         if (tag != null) {
             AuthManager.setDismissedUpdateTag(tag)
         }
-        AppUpdateCache.dismiss()
         AppUpdateCache.hideDialog()
     }
 
     /** Resume install when returning from Unknown Sources permission screen. */
     fun resumeInstallAfterPermission() {
         if (canRequestInstalls()) {
-            val dest = File(getApplication<Application>().cacheDir, APK_FILE_NAME)
             val available = updateAvailableForInstall()
-            if (dest.exists() && dest.length() > 0 && available != null) {
+            val dest = available?.let { updateApkFile(it.latestTag) }
+            if (dest != null && dest.exists() && dest.length() > 0L) {
                 _state.value = AppUpdateState.Installing(available.latestTag)
                 launchInstaller(dest)
             } else {
@@ -275,6 +242,18 @@ class AppUpdateViewModel(
         }
     }
 
+    /** Returning from the external installer is not proof that installation succeeded. */
+    fun reconcileInstallerReturn() {
+        if (_state.value !is AppUpdateState.Installing || !installerReturnPending) return
+        installerReturnPending = false
+        _state.value = lastAvailable ?: AppUpdateCache.state.value
+    }
+
+    private fun updateApkFile(tag: String): File {
+        val safeTag = tag.replace(Regex("[^A-Za-z0-9._-]"), "_")
+        return File(getApplication<Application>().cacheDir, "hermes-update-$safeTag.apk")
+    }
+
     private fun canRequestInstalls(): Boolean =
         try {
             getApplication<Application>().packageManager.canRequestPackageInstalls()
@@ -292,18 +271,14 @@ class AppUpdateViewModel(
                     apkFile,
                 )
             context.startActivity(installIntentFactory(uri))
+            installerReturnPending = true
         } catch (e: Exception) {
+            installerReturnPending = false
             _state.value = AppUpdateState.Error(INSTALLER_ERROR)
         }
     }
 
     private companion object {
-        const val APK_FILE_NAME = "hermes-update.apk"
-
-        val NETWORK_ERROR = "Network error — check your connection"
-        val GENERIC_CHECK_ERROR = "Couldn't check for updates"
-        val NO_RELEASE_ERROR = "No release found yet"
-        val NO_APK_ERROR = "Release has no APK asset"
         val DOWNLOAD_ERROR = "Download failed — tap to retry"
         val INSTALLER_ERROR = "Couldn't open the installer"
     }
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsSubPages.kt b/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsSubPages.kt
index 8d30bfaf..75344ee2 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsSubPages.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsSubPages.kt
@@ -262,6 +262,7 @@ internal fun SettingsAboutPage(
         },
 ) {
     val updateState by viewModel.state.collectAsStateWithLifecycle()
+    val currentUpdateState by androidx.compose.runtime.rememberUpdatedState(updateState)
     val checkReleaseCandidateUpdates by viewModel.checkReleaseCandidateUpdates.collectAsStateWithLifecycle()
     val context = LocalContext.current
     val lifecycleOwner = androidx.lifecycle.compose.LocalLifecycleOwner.current
@@ -270,8 +271,12 @@ internal fun SettingsAboutPage(
         val observer =
             androidx.lifecycle.LifecycleEventObserver { _, event ->
                 if (event == androidx.lifecycle.Lifecycle.Event.ON_RESUME) {
-                    if (updateState is com.m57.hermescontrol.data.update.AppUpdateState.NeedsUnknownSourcesPermission) {
+                    if (currentUpdateState is
+                            com.m57.hermescontrol.data.update.AppUpdateState.NeedsUnknownSourcesPermission
+                    ) {
                         viewModel.resumeInstallAfterPermission()
+                    } else {
+                        viewModel.reconcileInstallerReturn()
                     }
                 }
             }
diff --git a/app/src/test/java/com/m57/hermescontrol/data/update/AppUpdateCheckerNetworkTest.kt b/app/src/test/java/com/m57/hermescontrol/data/update/AppUpdateCheckerNetworkTest.kt
index 4bd6a811..e149cfcc 100644
--- a/app/src/test/java/com/m57/hermescontrol/data/update/AppUpdateCheckerNetworkTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/data/update/AppUpdateCheckerNetworkTest.kt
@@ -1,14 +1,21 @@
 package com.m57.hermescontrol.data.update
 
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.cancelAndJoin
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.test.runTest
 import okhttp3.OkHttpClient
 import okhttp3.mockwebserver.MockResponse
 import okhttp3.mockwebserver.MockWebServer
+import okhttp3.mockwebserver.SocketPolicy
 import org.junit.After
 import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
 import org.junit.Assert.assertNull
 import org.junit.Before
 import org.junit.Test
+import java.io.File
+import java.util.concurrent.TimeUnit
 
 /**
  * Endpoint contract for the opt-in release-candidate channel: the stable path
@@ -38,8 +45,11 @@ class AppUpdateCheckerNetworkTest {
     private fun enqueue(
         body: String,
         code: Int = 200,
+        headers: Map<String, String> = emptyMap(),
     ) {
-        server.enqueue(MockResponse().setResponseCode(code).setBody(body))
+        val response = MockResponse().setResponseCode(code).setBody(body)
+        headers.forEach(response::addHeader)
+        server.enqueue(response)
     }
 
     @Test
@@ -56,26 +66,62 @@ class AppUpdateCheckerNetworkTest {
     @Test
     fun fetchLatestRelease_releaseCandidatesScanTheReleasesList() =
         runTest {
+            enqueue(STABLE_BODY)
             enqueue(RELEASES_BODY)
 
             val info = checker().fetchLatestRelease(includeReleaseCandidates = true)
 
             assertEquals("v1.25.0-rc.3", info?.tagName)
-            assertEquals("/repos/Hy4ri/hermes-mobile/releases?per_page=20", server.takeRequest().path)
+            assertEquals("/repos/Hy4ri/hermes-mobile/releases/latest", server.takeRequest().path)
+            assertEquals("/repos/Hy4ri/hermes-mobile/releases?per_page=100&page=1", server.takeRequest().path)
         }
 
     @Test
-    fun fetchLatestRelease_releaseCandidatesStillIgnoreAlphaAndBeta() =
+    fun fetchLatestRelease_stableFallsBackToReleasesWhenLatestIsNotUsable() =
         runTest {
+            enqueue("{}")
+            enqueue(RELEASES_BODY)
+
+            val info = checker().fetchLatestRelease()
+
+            assertEquals("v1.24.2", info?.tagName)
+            assertEquals("/repos/Hy4ri/hermes-mobile/releases/latest", server.takeRequest().path)
+            assertEquals("/repos/Hy4ri/hermes-mobile/releases?per_page=100&page=1", server.takeRequest().path)
+        }
+
+    @Test
+    fun fetchLatestRelease_rcScanFollowsGithubPagination() =
+        runTest {
+            enqueue(STABLE_BODY)
+            val nextPage = server.url("/repos/Hy4ri/hermes-mobile/releases?per_page=100&page=2")
+            enqueue(RELEASES_BODY, headers = mapOf("Link" to "<$nextPage>; rel=\"next\""))
+            enqueue(
+                """[{"tag_name":"v1.26.0-rc.1","prerelease":true,"assets":[{"name":"release.apk","size":5,"browser_download_url":"https://example.com/new.apk"}]}]""",
+            )
+
+            val info = checker().fetchLatestRelease(includeReleaseCandidates = true)
+
+            assertEquals("v1.26.0-rc.1", info?.tagName)
+            assertEquals("/repos/Hy4ri/hermes-mobile/releases/latest", server.takeRequest().path)
+            assertEquals("/repos/Hy4ri/hermes-mobile/releases?per_page=100&page=1", server.takeRequest().path)
+            assertEquals("/repos/Hy4ri/hermes-mobile/releases?per_page=100&page=2", server.takeRequest().path)
+        }
+
+    @Test
+    fun fetchLatestRelease_releaseCandidatesStillIgnoreAlphaAndBetaButKeepStable() =
+        runTest {
+            enqueue(STABLE_BODY)
             enqueue(ALPHA_BETA_BODY)
 
-            assertNull(checker().fetchLatestRelease(includeReleaseCandidates = true))
+            assertEquals("v1.24.2", checker().fetchLatestRelease(includeReleaseCandidates = true)?.tagName)
         }
 
     @Test
     fun fetchLatestRelease_nonSuccessYieldsNull() =
         runTest {
-            // One queued response per request: stable path, then RC path.
+            // Each channel checks the stable endpoint and falls back to the list on 404.
+            enqueue("", code = 404)
+            enqueue("", code = 404)
             enqueue("", code = 404)
             enqueue("", code = 404)
 
@@ -83,6 +129,35 @@ class AppUpdateCheckerNetworkTest {
             assertNull(checker().fetchLatestRelease(includeReleaseCandidates = true))
         }
 
+    @Test
+    fun downloadApk_cancellingCoroutineCancelsNetworkAndDeletesPartialFile() =
+        runTest {
+            server.enqueue(MockResponse().setSocketPolicy(SocketPolicy.NO_RESPONSE))
+            val destination = File.createTempFile("hermes-update", ".apk")
+            destination.writeText("partial")
+            val download =
+                launch(Dispatchers.IO) {
+                    checker().downloadApk(server.url("/slow.apk").toString(), destination) {}
+                }
+
+            assertEquals("/slow.apk", server.takeRequest(5, TimeUnit.SECONDS)?.path)
+            download.cancelAndJoin()
+
+            assertFalse(destination.exists())
+        }
+
+    @Test
+    fun downloadApk_invalidUrlReturnsFailureAndDeletesDestination() =
+        runTest {
+            val destination = File.createTempFile("hermes-update", ".apk")
+            destination.writeText("partial")
+
+            val downloaded = checker().downloadApk("file:///tmp/release.apk", destination) {}
+
+            assertFalse(downloaded)
+            assertFalse(destination.exists())
+        }
+
     private companion object {
         const val STABLE_BODY = """
 {
diff --git a/app/src/test/java/com/m57/hermescontrol/data/update/AppUpdateCheckerTest.kt b/app/src/test/java/com/m57/hermescontrol/data/update/AppUpdateCheckerTest.kt
index 7efd13f5..9d130e10 100644
--- a/app/src/test/java/com/m57/hermescontrol/data/update/AppUpdateCheckerTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/data/update/AppUpdateCheckerTest.kt
@@ -183,6 +183,7 @@ class AppUpdateCheckerTest {
         draft: Boolean = false,
         prerelease: Boolean = false,
         withApk: Boolean = true,
+        apkUrl: String = "https://example.com/$tag.apk",
     ): UpdateInfo =
         UpdateInfo(
             tagName = tag,
@@ -194,7 +195,7 @@ class AppUpdateCheckerTest {
                         UpdateInfo.Asset(
                             name = "hermes-mobile-$tag.apk",
                             size = 1L,
-                            browserDownloadUrl = "https://example.com/$tag.apk",
+                            browserDownloadUrl = apkUrl,
                         ),
                     )
                 } else {
@@ -289,6 +290,55 @@ class AppUpdateCheckerTest {
         assertNull(selectLatestUpdate(listOf(release("v1.25.0", draft = true), release("v1.24.0", withApk = false))))
     }
 
+    @Test
+    fun selectLatestUpdate_rejectsPrereleaseTagsMislabelledAsStable() {
+        val releases =
+            listOf(
+                release("v1.30.0-rc.1"),
+                release("v1.29.0-alpha.1"),
+                release("v1.28.0-beta.2"),
+                release("v1.27.0"),
+            )
+
+        assertEquals("v1.27.0", selectLatestUpdate(releases)?.tagName)
+        assertEquals("v1.30.0-rc.1", selectLatestUpdate(releases, includeReleaseCandidates = true)?.tagName)
+    }
+
+    @Test
+    fun selectLatestUpdate_ignoresInvalidTagsAndUnusableApkUrls() {
+        val releases =
+            listOf(
+                release("not-a-version"),
+                release("v1.30.0", apkUrl = " "),
+                release("v1.29.0"),
+            )
+
+        assertEquals("v1.29.0", selectLatestUpdate(releases)?.tagName)
+    }
+
+    @Test
+    fun selectLatestUpdate_rejectsMalformedAndUnsupportedApkUrlsButAllowsHttp() {
+        val releases =
+            listOf(
+                release("v1.32.0", apkUrl = "https://bad host/release.apk"),
+                release("v1.31.0", apkUrl = "file:///tmp/release.apk"),
+                release("v1.30.0", apkUrl = "http://localhost/release.apk"),
+            )
+
+        assertEquals("v1.30.0", selectLatestUpdate(releases)?.tagName)
+    }
+
+    @Test
+    fun selectLatestUpdate_stableOutranksRcForSameVersion() {
+        val releases =
+            listOf(
+                release("v1.25.0-rc.10", prerelease = true),
+                release("v1.25.0"),
+            )
+
+        assertEquals("v1.25.0", selectLatestUpdate(releases, includeReleaseCandidates = true)?.tagName)
+    }
+
     @Test
     fun parseReleaseList_readsDraftAndPrereleaseFlags() {
         val json =
diff --git a/app/src/test/java/com/m57/hermescontrol/data/update/UpdateNoticeManagerTest.kt b/app/src/test/java/com/m57/hermescontrol/data/update/UpdateNoticeManagerTest.kt
index 06195d26..a8f2cabf 100644
--- a/app/src/test/java/com/m57/hermescontrol/data/update/UpdateNoticeManagerTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/data/update/UpdateNoticeManagerTest.kt
@@ -49,6 +49,7 @@ class UpdateNoticeManagerTest {
     @Before
     fun setUp() {
         Dispatchers.setMain(testDispatcher)
+        UpdateNoticeManager.resetForTests()
         AppUpdateCache.reset()
         // Unit tests run against the debug variant where the feature is
         // disabled by default — flip the knob on so the behavior is testable.
@@ -68,6 +69,7 @@ class UpdateNoticeManagerTest {
 
     @After
     fun tearDown() {
+        UpdateNoticeManager.resetForTests()
         UpdateNoticeManager.enabled = false
         unmockkAll()
         Dispatchers.resetMain()
@@ -92,7 +94,7 @@ class UpdateNoticeManagerTest {
         }
 
     @Test
-    fun checkOnLaunch_skipsWhenAlreadyCheckedWithin24Hours() =
+    fun checkOnLaunch_ignoresPersistedDailyCheckTimestampAfterColdStart() =
         runTest {
             val now = 1000000000000L
             every { AuthManager.getUpdateCheckDoneForVersion() } returns currentVersion
@@ -103,9 +105,24 @@ class UpdateNoticeManagerTest {
             UpdateNoticeManager.checkOnLaunch(checker, currentVersion, testDispatcher, now = now)
             advanceUntilIdle()
 
-            coVerify(exactly = 0) { checker.fetchLatestRelease() }
-            assertEquals(AppUpdateState.Idle, AppUpdateCache.state.value)
-            verify(exactly = 0) { AuthManager.setUpdateCheckDoneForVersion(currentVersion) }
+            coVerify(exactly = 1) { checker.fetchLatestRelease(false) }
+            assertTrue(AppUpdateCache.state.value is AppUpdateState.UpdateAvailable)
+            verify(exactly = 1) { AuthManager.setUpdateCheckDoneForVersion(currentVersion) }
+        }
+
+    @Test
+    fun checkOnLaunch_debouncesRepeatedForegroundChecksAfterSuccess() =
+        runTest {
+            val checker = mockk<AppUpdateChecker>()
+            coEvery { checker.fetchLatestRelease(false) } returns updateInfo()
+            val now = 1_000_000L
+
+            UpdateNoticeManager.checkOnLaunch(checker, currentVersion, testDispatcher, now)
+            advanceUntilIdle()
+            UpdateNoticeManager.checkOnLaunch(checker, currentVersion, testDispatcher, now + 1_000L)
+            advanceUntilIdle()
+
+            coVerify(exactly = 1) { checker.fetchLatestRelease(false) }
         }
 
     @Test
@@ -148,9 +165,9 @@ class UpdateNoticeManagerTest {
         }
 
     @Test
-    fun noticeTag_stableReleasePromptsDotRcFromPersistedCache() {
+    fun noticeTag_doesNotUsePersistedTagForStableInstall() {
         every { AuthManager.getLastKnownLatestTag() } returns "v1.25"
-        assertEquals("v1.25", UpdateNoticeManager.noticeTag("1.25.rc.1"))
+        assertNull(UpdateNoticeManager.noticeTag("1.25.rc.1"))
         assertNull(UpdateNoticeManager.noticeTag("1.25"))
     }
 
@@ -176,9 +193,11 @@ class UpdateNoticeManagerTest {
             UpdateNoticeManager.checkOnLaunch(checker, currentVersion, testDispatcher)
             advanceUntilIdle()
 
-            assertEquals(AppUpdateState.Idle, AppUpdateCache.state.value)
-            // Still marked done so a dead network can't spam the API per launch.
-            verify(exactly = 1) { AuthManager.setUpdateCheckDoneForVersion(currentVersion) }
+            assertEquals(
+                AppUpdateState.Error("Network error — check your connection", isCheckError = true),
+                AppUpdateCache.state.value,
+            )
+            verify(exactly = 0) { AuthManager.setUpdateCheckDoneForVersion(currentVersion) }
         }
 
     @Test
@@ -190,8 +209,41 @@ class UpdateNoticeManagerTest {
             UpdateNoticeManager.checkOnLaunch(checker, currentVersion, testDispatcher)
             advanceUntilIdle()
 
+            assertEquals(AppUpdateState.Error("No release found yet", isCheckError = true), AppUpdateCache.state.value)
+            assertFalse(AppUpdateCache.isDismissed("v1.22.0"))
+        }
+
+    @Test
+    fun checkOnLaunch_noReleaseDoesNotPersistSuccessfulCheck() =
+        runTest {
+            val checker = mockk<AppUpdateChecker>()
+            coEvery { checker.fetchLatestRelease(false) } returns null
+
+            UpdateNoticeManager.checkOnLaunch(checker, currentVersion, testDispatcher)
+            advanceUntilIdle()
+
+            verify(exactly = 0) { AuthManager.setUpdateCheckDoneForVersion(any()) }
+            verify(exactly = 0) { AuthManager.setLastUpdateCheckTimestamp(any()) }
+        }
+
+    @Test
+    fun checkOnLaunch_channelInvalidationDuringFetchPreservesNewChannelState() =
+        runTest {
+            every { AuthManager.isCheckingReleaseCandidateUpdates() } returns true
+            val checker = mockk<AppUpdateChecker>()
+            coEvery { checker.fetchLatestRelease(true) } coAnswers {
+                // A channel change invalidates the captured request while it is completing.
+                UpdateNoticeManager.channelChanged(enabled = false)
+                every { AuthManager.isCheckingReleaseCandidateUpdates() } returns false
+                updateInfo(tag = "v1.25.0-rc.3")
+            }
+
+            UpdateNoticeManager.checkOnLaunch(checker, currentVersion, testDispatcher)
+            advanceUntilIdle()
+
             assertEquals(AppUpdateState.Idle, AppUpdateCache.state.value)
-            assertFalse(AppUpdateCache.dismissed)
+            verify(exactly = 0) { AuthManager.setLastKnownLatestTag(any()) }
+            verify(exactly = 0) { AuthManager.setUpdateCheckDoneForVersion(any()) }
         }
 
     // ── noticeTag (dismissed/restart banner return) ─────────────────────
@@ -211,10 +263,10 @@ class UpdateNoticeManagerTest {
     }
 
     @Test
-    fun noticeTag_returnsPersistedNewerTagWhenCacheIdle() {
+    fun noticeTag_doesNotAdvertisePersistedTagWithoutFreshApkMetadata() {
         every { AuthManager.getLastKnownLatestTag() } returns "v1.22.0"
 
-        assertEquals("v1.22.0", UpdateNoticeManager.noticeTag(currentVersion))
+        assertNull(UpdateNoticeManager.noticeTag(currentVersion))
     }
 
     @Test
@@ -303,11 +355,11 @@ class UpdateNoticeManagerTest {
     }
 
     @Test
-    fun noticeTag_advertisesPersistedRcTagWhenOptedIn() {
+    fun noticeTag_doesNotUsePersistedRcTagWithoutApkMetadata() {
         every { AuthManager.getLastKnownLatestTag() } returns "v1.25.0-rc.3"
         every { AuthManager.isCheckingReleaseCandidateUpdates() } returns true
 
-        assertEquals("v1.25.0-rc.3", UpdateNoticeManager.noticeTag(currentVersion))
+        assertNull(UpdateNoticeManager.noticeTag(currentVersion))
     }
 
     @Test
@@ -336,10 +388,50 @@ class UpdateNoticeManagerTest {
             }
 
             UpdateNoticeManager.checkOnLaunch(checker, currentVersion, testDispatcher)
+            UpdateNoticeManager.channelChanged(enabled = false)
+            every { AuthManager.isCheckingReleaseCandidateUpdates() } returns false
             advanceUntilIdle()
 
-            // The late RC result must not reach the cache or the persisted tag.
+            // A genuine manager-mediated opt-out invalidates the in-flight RC result.
             assertEquals(AppUpdateState.Idle, AppUpdateCache.state.value)
             verify(exactly = 0) { AuthManager.setLastKnownLatestTag(any()) }
         }
+
+    @Test
+    fun checkOnLaunch_retriesAfterFailureBackoffInsteadOfPersistingFailureAsDone() =
+        runTest {
+            val checker = mockk<AppUpdateChecker>()
+            coEvery { checker.fetchLatestRelease(false) } throws IOException("offline") andThen updateInfo()
+            val now = 100_000L
+
+            UpdateNoticeManager.checkOnLaunch(checker, currentVersion, testDispatcher, now)
+            advanceUntilIdle()
+            UpdateNoticeManager.checkOnLaunch(checker, currentVersion, testDispatcher, now + 1_000L)
+            advanceUntilIdle()
+            UpdateNoticeManager.checkOnLaunch(
+                checker,
+                currentVersion,
+                testDispatcher,
+                now + UpdateNoticeManager.FAILURE_BACKOFF_MS + 1L,
+            )
+            advanceUntilIdle()
+
+            coVerify(exactly = 2) { checker.fetchLatestRelease(false) }
+            assertTrue(AppUpdateCache.state.value is AppUpdateState.UpdateAvailable)
+        }
+
+    @Test
+    fun noticeTag_dismissalAppliesOnlyToThatRelease() {
+        AppUpdateCache.update(
+            AppUpdateState.UpdateAvailable("v1.22.0", "https://example.com/1.apk", 1L),
+        )
+        AppUpdateCache.dismiss("v1.22.0")
+
+        assertNull(UpdateNoticeManager.noticeTag(currentVersion))
+
+        AppUpdateCache.update(
+            AppUpdateState.UpdateAvailable("v1.23.0", "https://example.com/2.apk", 1L),
+        )
+        assertEquals("v1.23.0", UpdateNoticeManager.noticeTag(currentVersion))
+    }
 }
diff --git a/app/src/test/java/com/m57/hermescontrol/ui/settings/AppUpdateViewModelTest.kt b/app/src/test/java/com/m57/hermescontrol/ui/settings/AppUpdateViewModelTest.kt
index 3c0079bd..40a0f377 100644
--- a/app/src/test/java/com/m57/hermescontrol/ui/settings/AppUpdateViewModelTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/ui/settings/AppUpdateViewModelTest.kt
@@ -10,12 +10,14 @@ import com.m57.hermescontrol.data.update.AppUpdateCache
 import com.m57.hermescontrol.data.update.AppUpdateChecker
 import com.m57.hermescontrol.data.update.AppUpdateState
 import com.m57.hermescontrol.data.update.UpdateInfo
+import com.m57.hermescontrol.data.update.UpdateNoticeManager
 import io.mockk.coEvery
 import io.mockk.coVerify
 import io.mockk.every
 import io.mockk.mockk
 import io.mockk.mockkObject
 import io.mockk.mockkStatic
+import io.mockk.slot
 import io.mockk.unmockkAll
 import io.mockk.verify
 import kotlinx.coroutines.CompletableDeferred
@@ -48,6 +50,7 @@ class AppUpdateViewModelTest {
     private lateinit var app: Application
     private lateinit var packageManager: PackageManager
     private lateinit var checker: AppUpdateChecker
+    private var rcUpdatesEnabled = false
 
     private val currentVersion = "1.21.0"
 
@@ -70,6 +73,8 @@ class AppUpdateViewModelTest {
     @Before
     fun setUp() {
         Dispatchers.setMain(testDispatcher)
+        UpdateNoticeManager.resetForTests()
+        UpdateNoticeManager.enabled = true
         AppUpdateCache.reset()
         mockkObject(AuthManager)
         every { AuthManager.getUpdateCheckDoneForVersion() } returns null
@@ -79,8 +84,12 @@ class AppUpdateViewModelTest {
         every { AuthManager.setLastUpdateCheckTimestamp(any()) } returns Unit
         every { AuthManager.getDismissedUpdateTag() } returns null
         every { AuthManager.setDismissedUpdateTag(any()) } returns Unit
-        every { AuthManager.isCheckingReleaseCandidateUpdates() } returns false
-        every { AuthManager.setCheckReleaseCandidateUpdates(any()) } returns Unit
+        rcUpdatesEnabled = false
+        every { AuthManager.isCheckingReleaseCandidateUpdates() } answers { rcUpdatesEnabled }
+        every { AuthManager.setCheckReleaseCandidateUpdates(any()) } answers {
+            rcUpdatesEnabled = firstArg()
+            Unit
+        }
 
         app = mockk(relaxed = true)
         every { app.cacheDir } returns File(System.getProperty("java.io.tmpdir"))
@@ -91,11 +100,17 @@ class AppUpdateViewModelTest {
 
         checker = mockk()
         coEvery { checker.fetchLatestRelease() } returns updateInfo()
-        coEvery { checker.downloadApk(any(), any(), any()) } returns true
+        val downloadDestination = slot<File>()
+        coEvery { checker.downloadApk(any(), capture(downloadDestination), any()) } coAnswers {
+            downloadDestination.captured.writeBytes(byteArrayOf(1))
+            true
+        }
     }
 
     @After
     fun tearDown() {
+        UpdateNoticeManager.resetForTests()
+        UpdateNoticeManager.enabled = false
         unmockkAll()
         Dispatchers.resetMain()
     }
@@ -237,14 +252,14 @@ class AppUpdateViewModelTest {
         }
 
     @Test
-    fun checkForUpdate_marksDoneEvenWhenCheckFails() =
+    fun checkForUpdate_marksDoneOnlyAfterSuccessfulDiscovery() =
         runTest {
             coEvery { checker.fetchLatestRelease() } throws IOException("boom")
 
             val vm = createViewModel()
             advanceUntilIdle()
 
-            coVerify(exactly = 1) { AuthManager.setUpdateCheckDoneForVersion(currentVersion) }
+            coVerify(exactly = 0) { AuthManager.setUpdateCheckDoneForVersion(currentVersion) }
         }
 
     // ── Update flow ─────────────────────────────────────────────────────
@@ -351,7 +366,7 @@ class AppUpdateViewModelTest {
             advanceUntilIdle()
 
             verify(exactly = 1) { AuthManager.setDismissedUpdateTag("v1.22.0") }
-            assertTrue(AppUpdateCache.dismissed)
+            assertFalse(AppUpdateCache.isDismissed("v1.22.0"))
             assertFalse(AppUpdateCache.isDialogVisible)
         }
 
@@ -392,7 +407,7 @@ class AppUpdateViewModelTest {
     @Test
     fun init_adoptsCachedRcOfferWhenOptedIn() =
         runTest {
-            every { AuthManager.isCheckingReleaseCandidateUpdates() } returns true
+            rcUpdatesEnabled = true
             AppUpdateCache.update(
                 AppUpdateState.UpdateAvailable("v1.25.0-rc.3", "https://example.com/rc.apk", 1L),
             )
@@ -419,6 +434,7 @@ class AppUpdateViewModelTest {
             advanceUntilIdle()
 
             assertTrue(vm.checkReleaseCandidateUpdates.value)
+            verify(exactly = 1) { UpdateNoticeManager.channelChanged(true) }
             verify(exactly = 1) { AuthManager.setCheckReleaseCandidateUpdates(true) }
             coVerify(exactly = 1) { checker.fetchLatestRelease(true) }
             assertEquals("v1.25.0-rc.3", (vm.state.value as AppUpdateState.UpdateAvailable).latestTag)
@@ -435,13 +451,14 @@ class AppUpdateViewModelTest {
             advanceUntilIdle()
 
             verify(exactly = 0) { AuthManager.setCheckReleaseCandidateUpdates(any()) }
+            verify(exactly = 0) { UpdateNoticeManager.channelChanged(any()) }
             coVerify(exactly = 1) { checker.fetchLatestRelease(false) }
         }
 
     @Test
     fun setCheckReleaseCandidateUpdates_offDropsStaleRcBeforeCheckingStable() =
         runTest {
-            every { AuthManager.isCheckingReleaseCandidateUpdates() } returns true
+            rcUpdatesEnabled = true
             coEvery { checker.fetchLatestRelease(true) } returns updateInfo(tag = "v1.25.0-rc.3")
 
             val vm = createViewModel()
@@ -487,7 +504,7 @@ class AppUpdateViewModelTest {
     @Test
     fun lateRcResultAfterOptOut_neverPublishesRcOrInstalls() =
         runTest {
-            every { AuthManager.isCheckingReleaseCandidateUpdates() } returns true
+            rcUpdatesEnabled = true
             val rcGate = CompletableDeferred<Unit>()
             coEvery { checker.fetchLatestRelease(true) } coAnswers {
                 withContext(NonCancellable) { rcGate.await() }