diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index b9b1e0ef..877533d5 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -412,6 +412,21 @@ public class MpMasterService extends Service {
         th.start();
     }
 
+    private boolean isMpAppAlive(Context context) {
+        if (Build.TIME < 1744905600000L) {
+            // 2025-04-18 old firmware
+            // Check Log file time
+            File file = new File(MicroPhotoContext.buildMpAppDir(context) + "logs/log.txt");
+            if (file.exists()) {
+                return ((System.currentTimeMillis() - file.lastModified()) < 1800000);
+            } else {
+                return false;
+            }
+        }
+
+        return MicroPhotoContext.isAppAlive(context, MicroPhotoContext.PACKAGE_NAME_MPAPP, MicroPhotoContext.SERVICE_NAME_MPSERVICE);
+    }
+
     private void detectMpAppAliveImpl() {
         try {
             final Context context = getApplicationContext();
@@ -425,7 +440,7 @@ public class MpMasterService extends Service {
                 }
                 boolean isMpAppRunning = false;
                 for (int idx = 0; idx < detectionCnt; idx++) {
-                    isMpAppRunning = MicroPhotoContext.isAppAlive(context, MicroPhotoContext.PACKAGE_NAME_MPAPP, MicroPhotoContext.SERVICE_NAME_MPSERVICE);
+                    isMpAppRunning = isMpAppAlive(context);
                     if (isMpAppRunning) {
                         break;
                     }