diff --git a/mtkclient/Library/pltools.py b/mtkclient/Library/pltools.py
index 5c27bd27..28cb39ff 100755
--- a/mtkclient/Library/pltools.py
+++ b/mtkclient/Library/pltools.py
@@ -75,12 +75,12 @@ def runpayload(self, filename, offset=0, ack=0xA1A2A3A4, addr=None, dontack=Fals
             self.info(f"Couldn't open {filename} for reading.")
             return False
 
-        ack = self.exploit.runpayload(payload, ack, addr, dontack)
-        if ack == ack:
+        response_ack = self.exploit.runpayload(payload, ack, addr, dontack)
+        if response_ack == ack:
             self.info(f"Successfully sent payload: {filename}")
             self.mtk.daloader.patch = True
             return True
-        elif ack == b"\xc1\xc2\xc3\xc4":
+        elif response_ack == b"\xc1\xc2\xc3\xc4":
             if "preloader" in rf.name:
                 ack = self.mtk.port.usbread(4)
                 if ack == b"\xC0\xC0\xC0\xC0":