Enter dfu mode
Press and hold the home and power button 10 second at the same time. If you see an apple, it's too slow. You have to start over, then release the power button and continue to press and hold Home for two seconds. If you see that you are connected to iTunes, you will fail and start over. If the screen is not bright after these two steps, enter dfu mode, and then you can use iTunes or other software to restore or refresh the machine.
Connect the computer
If this method fails, you can try to connect to the computer. The first step is to use the "restart" function in tools such as PP assistant and iTools. Congratulations if you succeed, or proceed to the next step if you don't succeed.
brush
Brush machine! Firmware can be restored by assistants or officials.
Apple after-sales specialty store
Users can go directly to the Apple after-sales store. If your mobile phone is under warranty, the staff can help you fix this problem or replace it for free. If it is not within the warranty period, then the specific charging method and maintenance method need to be further understood.