1. Press and hold the power button to turn it off.
2. At the same time, press and hold the volume down key+power on key. The startup interface appears, release it.
3. Select to erase the data through the volume up and down and confirm (the volume key is selected up and down, and the power key is confirmed). When the option appears, select Yes.
4. Automatically return to the menu, and then click Erase Cache.
5. Finally, select Restart to restart.