The steps to change the mobile phone system version are as follows:
1. Open AISI Assistant, and you can see the one-button brush button before connecting the mobile phone;
2. When the device is connected to AISI Assistant, AISI Assistant will automatically match the firmware that can be brushed according to your device. As shown in the figure below, we select the firmware version of "7. 1.2", and click "Brush the machine now" after "Automatically activate the device after successful connection" and "Brush the machine with user data" are both ticked.
3. Click "Brush Machine Now" to open the following interface. Don't move anything, just wait for him to finish.
It takes about five minutes to finish brushing.
Note: Brush machine is risky, please operate with caution.