Hi there.
I had my Nextbox send in for repair due to a fatal error. Now I’m trying to restore my Backup.
After doing Nextcloud enforces an update to v 23.0.8 but the update fails with the Error Message: Updates between multiple major versions and downgrades are unsupported.
Here the Nextcloud Forum entry: Updates between multiple major versions are unsupported - 
How to - Nextcloud community
Help is greatly appreciated