How to force shutdown the iPhone 8:

1. Press and hold the power button until a message slider to slide to shut down appears on the screen. Slide the slider to the right.

2. Long press the restart button combination. Please press and hold the following button combination at the same time: Power button + Home button.

3. Continue to hold these two buttons without releasing them. After about 10 seconds, the restart Apple logo will appear on the screen, then release the button.