1. If there is a problem with the downloaded development version of the brush package, you can log in to Xiaomi's official forum again to download the complete brush package, and then save it in the memory root directory of the mobile phone again to solve it again.

2. It may also be caused by the lack of double clearing before the phone is refreshed. When the phone is turned off, press and hold the power button and the volume+button to enter the recovery mode, then select Simplified Chinese-Clear Data, return to the main menu, and select Install update.zip to the system 1.