Imagine buying a used Samsung Galaxy S21 from an online marketplace. You factory reset the phone, only to be greeted by the previous owner’s email address. Without that password, the phone is a brick. You cannot call, text, or even access settings.
While SAMFW Tool is the best free option, here are a few alternatives if it fails on your specific model:
Keep an eye on your phone's screen. When a "Allow USB Debugging?" prompt appears, check "Always allow" and tap OK .
Switch your device’s region/CSC without a full data wipe.
SAMFW Tool is a free, lightweight Windows application designed specifically for Samsung devices. Version 4.7.1 is one of the most stable and widely trusted releases in the tool’s history. While the tool offers multiple advanced features—such as changing IMEI (in supported models), resetting network locks, removing MDM (Mobile Device Management), and factory resetting—its headline feature is .
Connect your Samsung phone to your PC via a USB cable.
