After the update to the 5.12.9 firmware I was experience some problems with some wifi devices. Because of that I wanted to roll-back to v5.9.32 in order to stabilize my network again.

When doing the roll-back I didn't read properly that all data from the controller would be deleted in the rollback. Luckily I have backups of the configuration available. But unfortunately the controller doesn't want to load the backup. I have 6 different versions (of the previous months) of backups available, they all give the same error. Without any explanation why it failed. 

I have tried it during the initial setup of the controller, where I got an error. After that I manually setup the controller newly and tried it again through the controller interface, with the same errors:

Does anyone has a solution for this? There is quite some network setup done so I don't want to hard-reset the router, switches and EAPs and start all over