Mi router does not work

For the amount of memory, 128MB, you have got Xiaomi MiWiFi 3G v2, without USB port.
There is only "snapshot" version for V2, so you don't have Luci GUI. Go to:

Very important information:
https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=522d5ff42835f7ad01c090b9ea1863f5d56b91d3

From here you must go to:

Luck