Specific operation:
1. Press and hold the lock button for 5 seconds, and the shutdown screen will appear.
2. If you can't turn it off because of screen failure, try to turn it off forcibly.
3. Keep pressing the lock screen button, and keep pressing the HOME button with the other hand.
4. Press and hold these two keys at the same time until a small apple appears on the screen, indicating that the restart is successful.
5. Due to the restart, the mobile phone screen can be restored at this time.