diff --git a/code/application/source/sf_app/code/source/app/sf_service.c b/code/application/source/sf_app/code/source/app/sf_service.c
index 2ac9744e5..584691cd3 100755
--- a/code/application/source/sf_app/code/source/app/sf_service.c
+++ b/code/application/source/sf_app/code/source/app/sf_service.c
@@ -264,6 +264,11 @@ SINT32 sf_USB_net_init(void)
 	static U16 flag = 0;
     UIMenuStoreInfo *puiPara = sf_app_ui_para_get();
 
+    if (!sf_app_while_flag())
+  {
+    printf("[%s:%d]is update ... \n", __FUNCTION__, __LINE__);
+    return;
+  }
     if (flag == 0) 
 	{
 		flag = 1;
diff --git a/code/application/source/sf_app/code/source/app/sf_system.c b/code/application/source/sf_app/code/source/app/sf_system.c
index 43f5905a0..791aaac55 100755
--- a/code/application/source/sf_app/code/source/app/sf_system.c
+++ b/code/application/source/sf_app/code/source/app/sf_system.c
@@ -1264,6 +1264,7 @@ UINT32 sf_4g_update(UINT8 *upFname)
     printf("[%s:%d] cmd:%s\n", __FUNCTION__, __LINE__,cmdStr);
 	
     if (ret == SF_SUCCESS) {
+		system("killall quectel-CM-EG91");
         ret = system(cmdStr);
         if (sf_poweron_type_get() == SF_MCU_STARTUP_RING) {
             sleep(2);