Solutions：
Please follow the steps：
1. Confirm whether the Mi router can surf the Internet normally.
2. Confirm that the mobile phone connects to the WiFi of the router.
3. The router's external network port is not Lan port.
4. Reset the router.
5. Update the firmware of the router to the latest, and update the Mi WiFi APP to the latest version.
6. Apply for after-sales service.
