First, why do you want to double clear/triple clear. Second, under what circumstances do you need to do this?

1, double clearing or triple clearing is the operation of deep cleaning of mobile phone data. If it is not dual-clearing, some data files in the previous system may conflict or replace files in the new system, resulting in various mobile phone failures. The most common thing is that after brushing the phone, you can't enter the system and stay in the boot animation screen. In addition, there may be unknown and supernatural problems such as unstable cell phone signal and inability to use Wifi. Generally speaking, double clearing is enough. )

2. When you brush a third-party ROM and want to brush back to the official ROM, or brush a third party from the official. Third-party ROM Brush the third-party ROM. Whether it is done by the same person or not, I suggest that it be cleaned twice or three times before brushing. When the high version of the official ROM returns to the low version, if the official ROM itself is greatly changed, then the official ROM should be upgraded to double clear or triple clear (if the official ROM is upgraded, the version span is too large, so it is theoretically unnecessary to double clear or triple clear). )

Here are the steps to swipe your card:

1. Download the complete card brush package and transfer it to the mobile phone for storage or external SD card.

2. settings > about mobile phone > system update > enter recovery mode (when the mobile phone is turned off, press and hold the power button+volume, and when the mobile phone vibrates and restarts, you will see the words Nubian logo, release the power button and continue to press the volume until you enter recovery mode, and the same is true for folding above).

3. Find the erasure data/factory reset and erasure cache partitions, clear them one by one, move the volume button up and down, and confirm the power button.

4. Move the cursor to apply the update from /sdcard or from external /sdcard, and then press the power button to confirm the upgrade.

5. After brushing your teeth, move the cursor to restart the system. Now restart the phone.