Does anybody know if it is possible to downgrade a WLC by dowloading a lower version of the code ?
Or does this depend on the versions ?
Gerard van Bon
You can Downgrade the WLC Release Version, but be careful of this note;
Caution: If you require a downgrade from one release to another, you may lose the configuration from your current release. The workaround is to reload the previous controller configuration files saved on the backup server or to reconfigure the controller.
Managing Controller Software and Configurations
The only rstriction I have seen to downgrading is with some of the Mesh Releases. You can see the details here;
Cisco 4400 Series Wireless LAN Controllers Release Notes
Hope this helps!