Solutions:

        1. Shut down the computer and turn off the power.

        2. Open the case cover and look for the black jumper cap behind the front panel. 

        3. Make the jumper cap jump two stitches in the opposite direction (if it’ s on 1 and 2 stitch, it will change on 2 and 3 stitch or 3 and 4 stitch).

        4. Connect the power, start the computer, input the password 888888 when you hear buzzing to verify if it’s successful.

        5. After it's restored successfully, shut down the computer and turn off the power.

        6. Adjust the jumper cap to the original position, close the case cover and the recovery will be completed.