Cannot install Minimserver after rolling back to Melco firmware v3.80

[hal1673]

I am having problems with v3.90 firmware on the Melco N1 and want to rollback to v3.80. Unfortunately I can't get Minimserver 0.8.5.4 working again.

My steps were:

1. Uninstall Minimserver 0.8.5.4. The logs tell me the uninstall was successful.
2. Rollback the Melco to v3.80. Again successful.
3. Re-install Minimserver 0.8.5.4 following the instructions for a fresh install. After the restore settings prompt the Melco reports 'cannot restore from newer version'.

If I re-install 3.90 then everything works and I can re-install Minimserver 0.8.5.4 as normal.

I assumed rolling back firmware on the Melco would completely clean Minimserver which seems to be the case as trying to uninstall or update rather than re-install does nothing. The files are still on the hard drive however.

Is there a way to make this work?