diff --git a/mtkclient/Library/mtk_da_cmd.py b/mtkclient/Library/mtk_da_cmd.py
index 6358841..32bbc18 100644
--- a/mtkclient/Library/mtk_da_cmd.py
+++ b/mtkclient/Library/mtk_da_cmd.py
@@ -111,7 +111,7 @@ class DA_handler(metaclass=LogBase):
                 self.info("Device is in Preloader-Mode :(")
 
 
-        if preloader is not None:
+        if preloader is not None and mtk.config.preloader is None:
             mtk.config.preloader = preloader
 
         if not mtk.daloader.upload_da(preloader=preloader):