1. Restore factory settings or double clear.

2. If the above methods are ineffective, you can upgrade the system firmware.

3. If the upgraded system firmware still doesn't work, it is recommended to contact the after-sales service for testing to see if it is caused by the screen failure of the mobile phone.

4. After the data of the mobile phone can be backed up, double clear the mobile phone. Double-clear method: after the phone is turned off, press and hold the power button and the volume down button at the same time to enter the engineering mode, clear the data and cache of the phone, and restart the phone to try.