diff --git a/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java b/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
index a3fa32ee..852ebb03 100644
--- a/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
+++ b/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
@@ -435,7 +435,22 @@ public class MicroPhotoService extends Service {
             System.exit(0);
         }
 
-        private void ProcessReceivedAction(Context context, Intent intent) {
+        private boolean isMpMasterAlive(Context context) {
+            if (Build.TIME < 1744905600000L) {
+                // 2025-04-18 old firmware
+                // Check Log file time
+                File file = new File(MicroPhotoContext.buildMasterAppDir(context) + "logs/mlog.txt");
+                if (file.exists()) {
+                    return ((System.currentTimeMillis() - file.lastModified()) < 1800000);
+                } else {
+                    return false;
+                }
+            }
+
+            return MicroPhotoContext.isAppAlive(context, MicroPhotoContext.PACKAGE_NAME_MPMASTER, MicroPhotoContext.SERVICE_NAME_MPMASTER);
+        }
+
+        private void ProcessReceivedAction(final Context context, final Intent intent) {
             String action = intent.getAction();
             if (TextUtils.equals(ACTION_HEARTBEAT, action)) {
                 long ts = System.currentTimeMillis();
@@ -461,18 +476,20 @@ public class MicroPhotoService extends Service {
 
                     mService.detectGpsStatus();
 
+                    /*
                     ConnectivityManager connectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
                     if (connectivityManager != null) {
                         if (!connectivityManager.isDefaultNetworkActive()) {
                             infoLog("DefaultNetwork is NOT Active");
                         }
                     }
+                     */
                 } catch (Exception ex) {
                     ex.printStackTrace();
                 }
 
                 try {
-                    boolean mpmstAlive = MicroPhotoContext.isAppAlive(context, MicroPhotoContext.PACKAGE_NAME_MPMASTER, MicroPhotoContext.SERVICE_NAME_MPMASTER);
+                    boolean mpmstAlive = isMpMasterAlive(context);
                     if (!mpmstAlive) {
                         Intent launchIntent = context.getPackageManager().getLaunchIntentForPackage(MicroPhotoContext.PACKAGE_NAME_MPMASTER);
                         // launchIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);