diff --git a/lib/screens/servers_screen.dart b/lib/screens/servers_screen.dart
index 9f1663e..f6c7fb5 100644
--- a/lib/screens/servers_screen.dart
+++ b/lib/screens/servers_screen.dart
@@ -78,13 +78,35 @@ class _ServersScreenState extends State<ServersScreen> {
         ],
       ),
     );
-    if (go == true) {
-      final ok = await UpdateService(widget.api.baseUrl).apply(info);
-      if (mounted && !ok) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(content: Text('Impossible d\'ouvrir le téléchargement.')),
-        );
-      }
+    if (go != true || !mounted) return;
+
+    final progress = ValueNotifier<double?>(0);
+    showDialog(
+      context: context,
+      barrierDismissible: false,
+      builder: (_) => AlertDialog(
+        title: const Text('Téléchargement…'),
+        content: ValueListenableBuilder<double?>(
+          valueListenable: progress,
+          builder: (_, p, __) => Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              LinearProgressIndicator(value: p),
+              const SizedBox(height: 10),
+              Text(p == null ? '' : '${(p * 100).round()} %'),
+            ],
+          ),
+        ),
+      ),
+    );
+
+    final ok = await UpdateService(widget.api.baseUrl)
+        .apply(info, onProgress: (p) => progress.value = p);
+    if (mounted) Navigator.of(context, rootNavigator: true).pop(); // ferme la progression
+    if (mounted && !ok) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Mise à jour impossible.')),
+      );
     }
   }
 
diff --git a/lib/services/update_service.dart b/lib/services/update_service.dart
index c8906df..e8ddd20 100644
--- a/lib/services/update_service.dart
+++ b/lib/services/update_service.dart
@@ -1,12 +1,15 @@
 import 'dart:convert';
+import 'dart:io';
 
 import 'package:http/http.dart' as http;
+import 'package:open_filex/open_filex.dart';
 import 'package:package_info_plus/package_info_plus.dart';
+import 'package:path_provider/path_provider.dart';
 import 'package:url_launcher/url_launcher.dart';
 
-/// Vérifie s'il existe une version plus récente (API `/version`) et, si oui,
-/// ouvre l'URL de l'APK (le navigateur télécharge, l'utilisateur installe —
-/// robuste, sans dépendance de packaging fragile).
+/// Détecte une version plus récente (`/version`) et l'installe **in-app** :
+/// télécharge l'APK dans le stockage de l'app puis lance l'installeur système
+/// (un seul tap « Installer »). Fallback navigateur si l'install directe échoue.
 class UpdateService {
   UpdateService(this._baseUrl);
   final Future<String> _baseUrl;
@@ -31,7 +34,39 @@ class UpdateService {
     return null;
   }
 
-  Future<bool> apply(UpdateInfo info) async {
+  /// Télécharge l'APK puis lance l'installeur. `onProgress` : 0.0 → 1.0
+  /// (ou null si la taille est inconnue). Renvoie true si l'installeur s'ouvre.
+  Future<bool> apply(UpdateInfo info, {void Function(double?)? onProgress}) async {
+    try {
+      final dir = await getExternalStorageDirectory() ?? await getTemporaryDirectory();
+      final file = File('${dir.path}/gamemanager-update.apk');
+
+      final req = http.Request('GET', Uri.parse(info.apkUrl));
+      final resp = await req.send().timeout(const Duration(seconds: 30));
+      if (resp.statusCode != 200) return _fallback(info);
+
+      final total = resp.contentLength ?? 0;
+      var received = 0;
+      final sink = file.openWrite();
+      await for (final chunk in resp.stream) {
+        sink.add(chunk);
+        received += chunk.length;
+        onProgress?.call(total > 0 ? received / total : null);
+      }
+      await sink.close();
+
+      final result = await OpenFilex.open(
+        file.path,
+        type: 'application/vnd.android.package-archive',
+      );
+      if (result.type == ResultType.done) return true;
+      return _fallback(info); // l'installeur n'a pas pris → navigateur
+    } catch (_) {
+      return _fallback(info);
+    }
+  }
+
+  Future<bool> _fallback(UpdateInfo info) async {
     final uri = Uri.parse(info.apkUrl);
     if (!await canLaunchUrl(uri)) return false;
     return launchUrl(uri, mode: LaunchMode.externalApplication);
diff --git a/pubspec.yaml b/pubspec.yaml
index b2ce81a..4cadd9e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -16,6 +16,8 @@ dependencies:
   shared_preferences: ^2.3.2
   package_info_plus: ^8.1.1
   url_launcher: ^6.3.1
+  path_provider: ^2.1.4
+  open_filex: ^4.5.0
   cupertino_icons: ^1.0.8
 
 dev_dependencies:
diff --git a/tool/patch_android.py b/tool/patch_android.py
index dac93e5..f05681c 100644
--- a/tool/patch_android.py
+++ b/tool/patch_android.py
@@ -62,14 +62,22 @@ if "signingConfigs {" not in s:
         r"(\n\s*buildTypes\s*\{)",
         '\n    signingConfigs {\n'
         '        release {\n'
-        '            keyAlias keystoreProperties["keyAlias"]\n'
-        '            keyPassword keystoreProperties["keyPassword"]\n'
-        '            storeFile file(keystoreProperties["storeFile"])\n'
-        '            storePassword keystoreProperties["storePassword"]\n'
+        '            keyAlias = keystoreProperties["keyAlias"]\n'
+        '            keyPassword = keystoreProperties["keyPassword"]\n'
+        '            storeFile = file(keystoreProperties["storeFile"])\n'
+        '            storePassword = keystoreProperties["storePassword"]\n'
         '        }\n    }\n\\1',
         s,
         count=1,
     )
+# Flutter 3.24 génère `signingConfig = signingConfigs.debug` (AVEC `=`). On gère
+# les deux formes pour ne jamais laisser le build release signé en clé debug
+# (sinon signature différente à chaque run CI → « conflit » à l'install de MAJ).
+before = s
+s = s.replace("signingConfig = signingConfigs.debug", "signingConfig = signingConfigs.release")
 s = s.replace("signingConfig signingConfigs.debug", "signingConfig signingConfigs.release")
+if s == before:
+    raise SystemExit("patch_android: ERREUR — ligne 'signingConfig ... debug' introuvable, "
+                     "signature release NON appliquée (build annulé)")
 open(gr, "w").write(s)
-print("patch_android: OK")
+print("patch_android: OK (signature release appliquee)")