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Hello, you can choose to back up important data (contacts, SMS, call records, applications), and then restore the factory settings.

This method can solve most unknown problems, without any harm to the mobile phone, and can be operated with confidence.

If it still doesn't work, I suggest you turn it off first, then press the volume+button and the power button at the same time to enter the recovery mode, choose to clear the data, and then complete the packaging through the line brush.

(I suggest you brush to the latest development version) and then use it to see if there are any problems you describe.

Please select the address of the brush package according to the model:/

Brush tutorial: Detailed tutorial on 6 kinds of brush for Xiaomi mobile phone-/thread-7106164-1.htmlPlease use the sixth brush method, and you will encounter some thorny brush problems:

Xiaomi mobile phone driver, brush tool, brush tutorial and ROM download complete summary post/thread-7778037-1-1.html

If the problem is still not solved after wire brushing, please go to the maintenance point near you for maintenance and testing.

Address and telephone enquiry:/service/post office