diff --git a/mbtk/libgsw_lib/gsw_gnss_interface.c b/mbtk/libgsw_lib/gsw_gnss_interface.c
index cb6b397..d6d7b01 100755
--- a/mbtk/libgsw_lib/gsw_gnss_interface.c
+++ b/mbtk/libgsw_lib/gsw_gnss_interface.c
@@ -394,9 +394,15 @@
 
 int32_t gsw_gnss_init(void)
 {
-    int ret;
+    int ret;  
     if(!inited)
     {
+        ret = system("serial_atcmd AT*IMLCONFIG=13");
+        if(ret != 0)
+        {
+            LOGE("serial_atcmd fail\n");
+            return GSW_HAL_NORMAL_FAIL;
+        }
         if(dlHandle_gnss == NULL)
             dlHandle_gnss = dlopen(lynqLib_gnss, RTLD_NOW);
         if(fun_ptr_log == NULL)
@@ -539,6 +545,12 @@
         return GSW_HAL_NORMAL_FAIL;
     if(inited)
     {
+        ret = system("serial_atcmd AT*IMLCONFIG=12");
+        if(ret != 0)
+        {
+            LOGE("serial_atcmd fail\n");
+            return GSW_HAL_NORMAL_FAIL;
+        }
         mbtk_gnss_deinit=(int(*)())dlsym(dlHandle_gnss, "mbtk_gnss_deinit");
         ret = mbtk_gnss_deinit();
         if(ret == 0)