Rak mine v2 not Onboard

Hallo, I bought an rak miner v2 (second hand) it was not yet bound to a wallet.
I started by binding , what worked. But setting up an location was not working. (It says hotspot has not been onboarded).

I have no Idea how to onboard it and setting up a location. I tryed with different app, I even updated the sd card manualy from mntd.

But nothing changed, what could be the problem, what can I try to solve my problem.