Open Settings-More Settings-Developer Options-Turn on USB debugging, USB installation -USB debugging (security settings).
Drop down the notification bar, edit it, and remove the switches such as driving mode, screen projection and Xiaomi mutual transmission. Reason: If you are a little obsessive-compulsive, such as wanting to freeze the screen projection, you need to remove the screen projection switch in the control center first. Otherwise, after the screen projection is frozen, the switch is still in a completely black state, which cannot be removed by editing after freezing, and can only be removed after thawing.
Download the refrigerator activator, send the compressed package to the computer via WeChat or QQ, and decompress it to the hard disk.
After the computer is decompressed, open the decompressed file and connect the mobile phone and the computer with USB. The USB interface can only be charged. Click to activate normal ADB mode. At the same time, open the refrigerator iceAPP on your mobile phone and go in step by step.