Force licence deactivation/uninstall minimserver Synology

[Fast Eddie]

So I've just upgraded to DSM7.1 and due to getting mixed up with the docker version and package centre (mainly that i didn't realise docker would automatically restart after upgrade) I've gotten into a situation where I've put minimserver on port 9791 which i can't access. Previously they were 9890/2 and i needed to swap them over so moved one temporarily.

edit to add: DS218+ Intel Celeron

I also can't delete the package and start again as the licence isn't deactivated. Something i can't do because of not getting to port 9791.

Can someone advise how the hell I can force uninstall, or remotely deactivate the licence?

Thanks
Ed