1. Maybe the phone crashed. You can unplug the battery, then install the battery, press and hold the volume button and power button, restart the phone to enter the quick start mode, then connect the computer and try to brush the complete system package again. If the brush is unsuccessful, you can brush it several times.

2. It is also possible that the FASTBOOT is damaged, and it is necessary to brush a new fastboot for the mobile phone to solve it; The specific brushing tutorial and brushing package can be obtained on Xiaomi's official forum.

3. In addition, the hardware failure of the mobile phone may always be in the fast start mode, such as memory failure, processor failure, motherboard chip or other parts failure. This situation can only be solved by contacting Xiaomi to conduct a comprehensive inspection and maintenance of the mobile phone after sale.