Brushing can be done in the following ways:
1. In the power-off state, press the volume reduction key+the power-on key to enter the recovery mode;
2. Choose to clear the data, restore the factory settings, clear the system cache, and perform double clearing;
3. Choose to install the brush package from the memory card and brush it into the brush package;
4. After brushing, choose to restart the phone and end the brushing.
note:
Different mobile phones enter recovery mode differently. If the first step does not go, you can try to enter the recovery mode yourself. Other commonly used operations are: volume up key+power on key, volume down key +HOME key+power on key.