Don't turn off your mobile phone, download a Huawei cloud host on your computer, then log off your Huawei account, turn it off after logging off, and then press the volume up button and the power off button. When the button to restore the factory comes out, you can directly restore the factory and re-register a Huawei account.
This method is the safest by far, because if you go back to the factory directly, he still has the sign of healthy use of mobile phones. If you rely on a bug card, he still can't get it. If you can get rid of that time, you can't get rid of that downloaded application.