Extract the ZIP file to a convenient location on your computer (e.g., Desktop).
Upon reaching the Startup Settings list, press or F7 on your keyboard to select Disable driver signature enforcement . spd driver r420 download verified
The flashing tool cannot access the COM port. Ensure that no other mobile management software (like Samsung Smart Switch, iTunes, or Android Studio ADB daemons) is running in the background competing for the USB interface. Extract the ZIP file to a convenient location