2. After the 2.iPhone is turned off, press and hold the Home button for a long time to connect the device to the computer through the USB cable, or please connect the device to the computer, press and hold the power button first, and then continue to press and hold the On/Key and Home button at the same time until the second time. Please immediately release the on/off key and continue to press and hold the Home key until the computer recognizes that the USB device is in DFU state, and then enter DFU mode.

3. At this point, iTunes will start automatically or manually.

4.ITunes will automatically detect the devices waiting to be restored, and then click OK.

5. Hold down the shift key on the keyboard and "Restore" on iTunes, and select the iOS download device, which will start to refresh the computer and restore to a brand-new system.

6. When the recovery is complete, click "Set as New Device" on iTunes.

7. After success, the mobile phone will return to the state of not jailbreaking. The above is the recovery method after c 1 jailbreak restart.