The newly bought Xiaomi 3 can't set wallpaper, and the background will be completely black or become the original wallpaper after wallpaper is pasted.

Just back up the data and restore the factory settings.

You can choose to back up important data (contacts, SMS, call history, 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 brush the whole package (I suggest you brush it to the latest development version) before using it to see if there are any problems you described. 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 encounter brush problems: Xiaomi mobile phone driver, brush tool, brush tutorial and ROM download the complete summary post /thread-70.