First, search Huawei's official recovery online, find a suitable model, and download the compressed file. After downloading, unzip and open the application. After opening, click to brush into the official REC. At the same time, the mobile phone starts USB debugging and connects the computer. Then find a suitable model to search for the brush package to download, then unzip the file to create a new dload folder, copy the update.app file, and then copy the entire dload folder to the root directory of the SD card. Be sure to keep the phone fully charged, turn it off, and press and hold the volume up button+volume down button+power button to enter the forced brushing mode. After the phone is restarted, it will revert to the old version.

The specific operation steps are as follows:

1. Search Huawei's official recovery online first, find a suitable model, and download the compressed file.

2. Decompress and open the application after downloading.

3. Click to brush into the official REC after opening. At the same time, the phone starts USB debugging and connects to the computer.

4. Find a suitable model to search for the brush package to download.

5. Unzip the file, then create a new dload folder, copy the update.app file, and then copy the entire dload folder to the root directory of the SD card. Keep the phone fully charged, turn it off, and press and hold the volume up button+volume down button+power button to enter the forced brushing mode.

6. When the phone is swiped and restarted, the system will be successfully restored to the old version.