diff --git a/app/src/main/kotlin/org/meshtastic/app/MainActivity.kt b/app/src/main/kotlin/org/meshtastic/app/MainActivity.kt
index 0864e55cd..628865010 100644
--- a/app/src/main/kotlin/org/meshtastic/app/MainActivity.kt
+++ b/app/src/main/kotlin/org/meshtastic/app/MainActivity.kt
@@ -59,6 +59,7 @@ import org.meshtastic.app.node.metrics.getTracerouteMapOverlayInsets
 import org.meshtastic.app.ui.MainScreen
 import org.meshtastic.core.barcode.rememberBarcodeScanner
 import org.meshtastic.core.navigation.DEEP_LINK_BASE_URI
+import org.meshtastic.core.network.repository.UsbRepository
 import org.meshtastic.core.nfc.NfcScannerEffect
 import org.meshtastic.core.resources.Res
 import org.meshtastic.core.resources.channel_invalid
@@ -91,6 +92,8 @@ import org.meshtastic.feature.node.metrics.TracerouteMapScreen
 class MainActivity : ComponentActivity() {
     private val model: UIViewModel by viewModel()
 
+    private val usbRepository: UsbRepository by inject()
+
     /**
      * Activity-lifecycle-aware client that binds to the mesh service. Note: This is used implicitly as it registers
      * itself as a LifecycleObserver in its init block.
@@ -166,6 +169,16 @@ class MainActivity : ComponentActivity() {
         handleIntent(intent)
     }
 
+    override fun onResume() {
+        super.onResume()
+        // Belt-and-suspenders for the Android 12+ attach-intent quirk: if the activity is
+        // resumed while a USB device is already attached (e.g. process restart, returning
+        // from another app), the manifest-declared attach intent may have already fired
+        // before UsbRepository was constructed. Re-poll deviceList here so the UI reflects
+        // reality without requiring the user to physically replug.
+        usbRepository.refreshState()
+    }
+
     @Composable
     private fun AppCompositionLocals(content: @Composable () -> Unit) {
         CompositionLocalProvider(
@@ -257,6 +270,11 @@ class MainActivity : ComponentActivity() {
 
             UsbManager.ACTION_USB_DEVICE_ATTACHED -> {
                 Logger.d { "USB device attached" }
+                // Android 12+ delivers ACTION_USB_DEVICE_ATTACHED only to manifest-declared
+                // receivers, so the runtime-registered UsbBroadcastReceiver inside UsbRepository
+                // never sees this event. Forward it explicitly so the serialDevices StateFlow
+                // refreshes and the device shows up in the Connect → Serial tab.
+                usbRepository.refreshState()
                 showSettingsPage()
             }
 
diff --git a/core/network/src/androidMain/kotlin/org/meshtastic/core/network/repository/UsbRepository.kt b/core/network/src/androidMain/kotlin/org/meshtastic/core/network/repository/UsbRepository.kt
index b4773dff3..c5080ec14 100644
--- a/core/network/src/androidMain/kotlin/org/meshtastic/core/network/repository/UsbRepository.kt
+++ b/core/network/src/androidMain/kotlin/org/meshtastic/core/network/repository/UsbRepository.kt
@@ -54,9 +54,7 @@ class UsbRepository(
         _serialDevices
             .mapLatest { serialDevices ->
                 val serialProber = usbSerialProberLazy.value
-                buildMap {
-                    serialDevices.forEach { (k, v) -> serialProber.probeDevice(v)?.let { driver -> put(k, driver) } }
-                }
+                buildMap { serialDevices.forEach { (k, v) -> serialProber.probeDevice(v)?.let { put(k, it) } } }
             }
             .stateIn(processLifecycle.coroutineScope, SharingStarted.Eagerly, emptyMap())
 
@@ -83,6 +81,8 @@ class UsbRepository(
         processLifecycle.coroutineScope.launch(dispatchers.default) { refreshStateInternal() }
     }
 
-    private suspend fun refreshStateInternal() =
-        withContext(dispatchers.default) { _serialDevices.emit(usbManagerLazy.value?.deviceList ?: emptyMap()) }
+    private suspend fun refreshStateInternal() = withContext(dispatchers.default) {
+        val devices = usbManagerLazy.value?.deviceList ?: emptyMap()
+        _serialDevices.emit(devices)
+    }
 }