diff --git a/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java b/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
index dec47bba..ccd9b111 100644
--- a/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
+++ b/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
@@ -479,7 +479,7 @@ public class MicroPhotoService extends Service {
         }
 
         private boolean isMpMasterAlive(Context context) {
-            if (Build.TIME < 1744905600000L) {
+            if (Build.TIME < MicroPhotoContext.BUILD_TIME_WO_SID_20250418) {
                 // 2025-04-18 old firmware
                 // Check Log file time
                 File file = new File(MicroPhotoContext.buildMasterAppDir(context) + "logs/mlog.txt");
@@ -595,7 +595,7 @@ public class MicroPhotoService extends Service {
                             try {
                                 boolean mpmstAlive = isMpMasterAlive(context);
                                 if (!mpmstAlive) {
-                                    if (Build.TIME >= 1744905600000L) {
+                                    if (Build.TIME >= MicroPhotoContext.BUILD_TIME_WO_SID_20250418) {
                                         int pid = MicroPhotoContext.getProcessIdOfService(context, MicroPhotoContext.PACKAGE_NAME_MPMASTER, MicroPhotoContext.SERVICE_NAME_MPMASTER);
                                         if (pid != 0) {
                                             android.os.Process.killProcess(pid);