Enter recovery mode, double clearing, enter recovery mode:
If the phone is turned on, please turn it off first, unplug the battery and then install it. In the case of shutdown, press and hold the power key +Home key at the same time until the recovery interface appears.
If none of the above methods can be accessed, then turn it on again, first press and hold the volume+key, and then press and hold the power-on key for a long time until the recovery interface appears.
Resume mode (power key confirmed, volume moved up and down), the steps are as follows:
Shut down completely (it is best to unplug the battery after shutdown), and then enter the recovery interface through a special key combination.
Select Erase Data/Restore Factory Settings and press the power button to confirm, and then press OK if Yes is selected; Then select Erase Cache Partition and press OK, then select Yes and OK.