Second hand wax630 keeps restoring to insight

I have 4 second hand wax630 that are unable to restore to factory defaults

When I restore them to factory default I am able to access the web page one time and when I try a manual setup it reboots and restores the previous owner insight settings. Tried this multiple times and was able to do a firmware upgrade on it, but after a while it keeps restoring to the previous owners insight setting

Offcourse I have no access to this account, I have aquired them legally offcourse but find it strange that if someone locks them nobody can access them. I guess when an it manager leaves a company the company is pretty much screwed (or when the it support firm goes out off bussiness)

Anyone a solution for this