You try the following operations

1. put the phone's System Settings - Developer Options - USB debugging open

2. please check the computer side of the phone driver has not been installed successfully, click xiaomi install the driver and carefully read the READ ME file, or in the computer side of the computer to find the computer - right-click Properties - Hardware - Device Management If there is an exclamation mark Remember to update the driver, tutorials, and so on. Device Management If there is an exclamation mark remember to update the driver tutorial: www.xiaomi.cn/content-19-6735-1.html

3. Download the latest version of the Xiaomi Assistant to connect to the installation can be.

Xiaomi Mobile Assistant official website / html/special/mizhushou/

A more detailed description of the problem will help users understand the trouble you are experiencing and help you solve the problem more accurately. Thank you for supporting Xiaomi Mobile!