diff --git a/Fly App/android/app/src/main/kotlin/com/pilotvault/flyapp/DjiSdkBridge.kt b/Fly App/android/app/src/main/kotlin/com/pilotvault/flyapp/DjiSdkBridge.kt
index ed524f4..10be3ff 100644
--- a/Fly App/android/app/src/main/kotlin/com/pilotvault/flyapp/DjiSdkBridge.kt	
+++ b/Fly App/android/app/src/main/kotlin/com/pilotvault/flyapp/DjiSdkBridge.kt	
@@ -49,6 +49,14 @@ class DjiSdkBridge(
          */
         private const val IDENTITY_RETRY_MS = 2_000L
         private const val IDENTITY_MAX_ATTEMPTS = 30
+
+        /**
+         * The SDK can swallow a registration failure without ever calling
+         * [DJISDKManager.SDKManagerCallback.onRegister] — e.g. it logs "Exception when
+         * executing encrypt/decrypt functions" when DJI's server rejects the App Key —
+         * leaving the app on "Registering…" forever. Give up after this long.
+         */
+        private const val REGISTRATION_TIMEOUT_MS = 60_000L
     }
 
     private val mainHandler = Handler(Looper.getMainLooper())
@@ -57,6 +65,19 @@ class DjiSdkBridge(
 
     private var eventSink: EventChannel.EventSink? = null
 
+    private val registrationTimeout = Runnable {
+        emit(
+            mapOf(
+                "type" to "registration",
+                "state" to "failed",
+                "error" to "DJI did not answer the registration within " +
+                    "${REGISTRATION_TIMEOUT_MS / 1000} s. Check the internet connection, " +
+                    "and that the DJI App Key is activated for package " +
+                    "${appContext.packageName}.",
+            )
+        )
+    }
+
     /**
      * The *flight controller's* serial number — not the aircraft's.
      *
@@ -181,12 +202,16 @@ class DjiSdkBridge(
 
     private fun registerApp() {
         emit(mapOf("type" to "registration", "state" to "registering"))
+        mainHandler.removeCallbacks(registrationTimeout)
+        mainHandler.postDelayed(registrationTimeout, REGISTRATION_TIMEOUT_MS)
 
         DJISDKManager.getInstance().registerApp(
             appContext,
             object : DJISDKManager.SDKManagerCallback {
 
                 override fun onRegister(error: DJIError?) {
+                    // A late answer still wins: it replaces a timed-out "failed".
+                    mainHandler.removeCallbacks(registrationTimeout)
                     if (error == DJISDKError.REGISTRATION_SUCCESS) {
                         emit(mapOf("type" to "registration", "state" to "success"))
                         DJISDKManager.getInstance().startConnectionToProduct()
diff --git a/Fly App/lib/main.dart b/Fly App/lib/main.dart
index c2a273f..a427433 100644
--- a/Fly App/lib/main.dart	
+++ b/Fly App/lib/main.dart	
@@ -173,6 +173,9 @@ class _HomePageState extends State<HomePage> {
           case 'failed':
             _model.registration = RegistrationState.failed;
             _model.registrationError = event['error'] as String?;
+            // The error otherwise only shows in the settings sheet, which the
+            // home "Connect aircraft" flow never opens.
+            _snack('Registration failed: ${_model.registrationError ?? 'unknown error'}');
             break;
         }
         _model.bump();