Reset / delete config files of Virtualization Station

[jochenthomas]

Because of the faulty 5.0 firmware, it was necessary to downgrade and later install the newest firmware (TVS871).
During this process, the Virtualization Stations most likely got corrupted (before the FW update all was working fine).

After starting the Virtualization Station now I see only the spinner together with "Loading".
Checking the other tabs/function will not give any other information.
Nothing happens.
Restart is not helping, Deinstalling & Reinstalling is not helping either.

So, I guess I have to remove old config files using SSH to be able to start completely new.
Where I can find the config files of the virtualization station?
How I can reset or delete all config files (and install the virtualization station completely new)?
What is the best way?
Thanks for any advice...