1. Download iTunes on the computer, turn off the phone and connect it to the computer through the data cable.

2. After the connection is completed, press and hold the power button of the phone for 3 seconds, and the Apple logo will appear.

3. Then press the home button and power button at the same time for 10 seconds. At this time, the phone will have a black screen.

4. Then release the power button and continue to hold the home button for 30 seconds.

5. iTunes on the computer appears: An iPhone in recovery mode is detected, click OK, and release the home button to enter recovery mode.