Card swiping process:
1, first download a corresponding model of card brush root package (which can be officially downloaded).
2. Put the downloaded brush package directly in the root directory of the SD card (some devices do not support external memory cards, and can be copied to the built-in memory card, and the same is true).
3. Turn off the phone, take out the SIM card and install the memory card. It is recommended to back up the important things in the memory card.
4. When turning off the machine, press the power-on button and the volume plus button for about ten seconds at the same time, and then let go.
5. Enter the recovery mode, that is, REC mode.
6. Select Erase Cache Partition to clean up the cache.
7. After clearing the cache, select Erase Data/Factory Restore Factory Settings.
8. Select "Install zip from sdcard" first, and then select "Apply sdcard: Update", that is, select the brush package from the memory card and wait patiently for completion.