Help needed I can’t get my xiaomi router 3g unbricked

[Willy]

Xiaomi Mi Router 4A Gigabit Edition (R4AG/R4A Gigabit) -- fully supported and flashable with OpenWRTInvasion

The WAN port, that one next to the reset button, has "only" 2 different adresses, at least in my case. They differ only in the last digit. Every time after I tried to flash openwrt, it came up with the "second" address. In "normal" mode it was always what I call the "first" address. I found the other addresses on the, let's say bootp-port on the right side, and only during bootp/startup.