If you turn on USB mode before locking the screen, it will be much easier. Just download a screen-brushing wizard from the computer, connect the tablet after opening it, and select Clear Lock Screen on the right. The computer downloads an adb toolkit, decompresses it, puts it in the root directory of the computer's C drive, and connects the tablet. The connection here means that you don't need to turn on USB mode, as long as the flat panel display is charged after connection. After that, open adb and choose to delete the file named *. Key to clear the screen lock password.