diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index d5376172..25269c10 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -412,7 +412,7 @@ public class MpMasterService extends Service {
     }
 
     private boolean isMpAppAlive(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.buildMpAppDir(context) + "logs/log.txt");
@@ -874,7 +874,7 @@ public class MpMasterService extends Service {
         try {
             Intent relaunchIntent = new Intent();
 
-            if (Build.TIME < 1744905600000L) {
+            if (Build.TIME < MicroPhotoContext.BUILD_TIME_WO_SID_20250418) {
                 // Earlier than 2025-04-18
                 relaunchIntent.putExtra("cmd", "reboot");
             } else {
@@ -890,7 +890,7 @@ public class MpMasterService extends Service {
 
             PendingIntent sysKAPendingIntent = PendingIntent.getBroadcast(this, BROADCAST_REQUEST_CODE_SYS_KEEPALIVE, relaunchIntent, PendingIntent.FLAG_UPDATE_CURRENT);
             alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, launchTs, sysKAPendingIntent);
-            if (Build.TIME < 1744905600000L) {
+            if (Build.TIME < MicroPhotoContext.BUILD_TIME_WO_SID_20250418) {
                 logger.info(String.format("Register KeepAlive Reboot Clock: " + format.format(new Date(launchTs))));
             } else {
                 logger.info(String.format("Register KeepAlive Launch Clock: " + format.format(new Date(launchTs))));
@@ -1292,7 +1292,7 @@ public class MpMasterService extends Service {
     }
 
     private static void forceStopMpApp(Context context) {
-        if (Build.TIME < 1744905600000L) {
+        if (Build.TIME < MicroPhotoContext.BUILD_TIME_WO_SID_20250418) {
             // 2025-04-18
             SysApi.forceStopApp(context, MicroPhotoContext.PACKAGE_NAME_MPAPP);
         } else {