Visit official website
In the download interface - click on the client to download "Xiaomi Router Repair Tool" to download
the flash package, select ROM, find the corresponding router model,
open the flash software,
select the image package
to start the flash software, and if the computer network card is set to DHCP to automatically obtain the IP, it will be automatically modified to 192.168 .31.xxx,
Open the web page 192.168.31.1, select the file: "Official original version miwifi_r1cl_firmware_82b5c_2.7.81.bin", upload it and wait for restoration