diff --git a/code/application/source/sf_app/code/source/4gMng/sf_ftp.c b/code/application/source/sf_app/code/source/4gMng/sf_ftp.c
index 066aa20dd..df0fc9622 100755
--- a/code/application/source/sf_app/code/source/4gMng/sf_ftp.c
+++ b/code/application/source/sf_app/code/source/4gMng/sf_ftp.c
@@ -1394,6 +1394,7 @@ SINT32 sf_4g_module_ota_ftp(void)
 
     ret = ftp_download_file(SF_MODULE_UP_FILE,SF_MODULE_UP_FILE_PATH,0);
     if(SUCCESS == ret){
+        system("sync");
         sprintf(Cmd, "tar -xjvf %s -C %s", SF_MODULE_UP_FILE_PATH, SF_SD_ROOT);
         MLOGD("%s\n", Cmd);
         ret = system(Cmd);
@@ -1518,6 +1519,7 @@ SINT32 sf_camera_ota_ftp(void)
         // MLOGD("%s\n", Cmd);
         // ret = system(Cmd);
         if(SUCCESS == ret){
+            system("sync");
             sf_set_fw_update(1);
             sf_set_key_fw_update(sf_get_fw_update());
             while(sf_get_fw_update())