Hi, I got a used miner, it seemed to have worked fine for some time, but suddenly yesterday it changed mining address and pool, I tried flashing it with SD card but nothing changes.

Is there anything I can do to recover him?

The "hacking" affects the board or the chains? (ex. can I use the chains in another s9 without worry?)

To safeguard the other miners in the network, if I change the admin password of the other miners will they be safe?

https://imgur.com/a/sROJIM0