diff --git a/App/app_update.c b/App/app_update.c
index 5dc374d..78efe35 100644
--- a/App/app_update.c
+++ b/App/app_update.c
@@ -84,7 +84,6 @@ static void update_on_download(uint8_t* frame, int len, uint8_t* pload, int size
 
                     if (crc_rom == g_update.cfg.Crc32Check)
                     {
-                        g_update.cfg.AppFlag = 0;
                         g_update.cfg.UpdateFlag = 0;
                         g_update.cfg.PackageNum = 0;
 
@@ -188,6 +187,8 @@ int app_update_entry(struct pt  *pt)
     if (g_update.cfg.UpdateFlag == APP_UPDATE_FLAG)
     {
         g_update.isNeedUpdate = 1;
+        g_update.cfg.AppFlag = APP_BOOT_UPGRADE_FLAG;
+        dev_boot_write_param(g_update.cfg);
     }
     else
     {
diff --git a/device/dev_boot.h b/device/dev_boot.h
index 4545252..e688f79 100644
--- a/device/dev_boot.h
+++ b/device/dev_boot.h
@@ -5,6 +5,7 @@
 
 #define	APP_START_FLAG						0x55AA5A5A
 #define	APP_UPDATE_FLAG						0xA5A5AA55
+#define	APP_BOOT_UPGRADE_FLAG					0x5A5A55A5
 
 #define	BOOT_BASE							(FLASH_BASE)
 #define	BOOT_SIZE							(4*FLASH_SECTOR_SIZE)
@@ -15,8 +16,6 @@
 #define BOOT_PARA_ADDRESS				    (APP_ADDRESS + APP_SIZE)
 #define	BOOT_PARA_SIZE					    (FLASH_SECTOR_SIZE)
 
-#define	APP_START_FLAG		0x55AA5A5A
-#define	APP_UPDATE_FLAG		0xA5A5AA55
 
 typedef struct {
 	uint32_t AppFlag;