1. Connect your phone to your computer and start iTunes.
2. Back up the important contents of the mobile phone, click Synchronize, and then enter the following recovery operation interface.
3. Turn off the iPhone, press the right key and the volume reduction key at the same time, and continue to press when the white sign appears on the screen. Later, an icon connecting the data cable to itunes will appear on the screen.
4. In iTunes, a dialog box pops up: iPhone in recovery mode is detected, and click OK.
5. Click to restore iPhone.
6. Wait for the recovery to be successful, restore the backup directly, and click Continue to complete the recovery.
Extended data:
Precautions for reinstalling the iphone system:
1, brush machine risk. Although the brush machine is generally safe, there are some risks. For example, after brushing, the manufacturer no longer guarantees, and the failure of brushing may cause the mobile phone to fail to start. Brushing the brush package with unknown origin may have security risks, and even there is a small possibility of damaging the hardware of the mobile phone. Be sure to know something before brushing the machine and operate it carefully and safely.
2, unlock the problem. At present, most mobile phone manufacturers will set BL locks on their mobile phones to prevent changes to the mobile phone system. Therefore, the brush (whether it is a card brush or a wire brush) must be unlocked before.
3. When you brush the machine, you must ensure that the battery power of the mobile phone is enough for this brush machine.
Please read the operating instructions carefully before brushing your teeth.
5. It is best to brush the machine under the premise of risk control.