diff --git a/tools/sdk/include/user_interface.h b/tools/sdk/include/user_interface.h
index 314c24d02..f80d9c057 100644
--- a/tools/sdk/include/user_interface.h
+++ b/tools/sdk/include/user_interface.h
@@ -729,8 +729,8 @@ typedef struct {
   *
   * @param     wifi_country_t *country: the configured country info
   *
-  * @return  0 : succeed
-  * @return -1 : fail
+  * @return  true : succeed
+  * @return false : fail
   */
 bool wifi_set_country(wifi_country_t *country);
 
@@ -739,8 +739,8 @@ bool wifi_set_country(wifi_country_t *country);
   *
   * @param     wifi_country_t *country: country info
   *
-  * @return  0 : succeed
-  * @return -1 : fail
+  * @return  true : succeed
+  * @return false : fail
   */
 bool wifi_get_country(wifi_country_t *country);
 
diff --git a/tools/sdk/lib/libmain.a b/tools/sdk/lib/libmain.a
index 8886b1956..c0e70cafe 100644
Binary files a/tools/sdk/lib/libmain.a and b/tools/sdk/lib/libmain.a differ
diff --git a/tools/sdk/lib/libpp.a b/tools/sdk/lib/libpp.a
index 50f5cf117..6135231c7 100644
Binary files a/tools/sdk/lib/libpp.a and b/tools/sdk/lib/libpp.a differ