I got some replies now:
Fulvio:
Sorry for the inconvenience. I do not know that device so I cannot help you. In the future I’ll try supporting it.
Soekris:
As we only make hardware it’ll be up to the zeroshell project to update their image to work with the net6501. I haven’t tried myself so I can only rely on the topic you linked but it seems like something needs to be updated in Zeroshell.
Any suggestions anyone how to get out of this loop?