I upgraded my CallManager from 8.5.1 to 9.1.2 over the weekend, I learned on Monday about an incompatability between CUCM 9.1.2 and UCCX and need to revert back to my previous 8.5.1 install. I know that the jump from 8.5.1 to 9.1.2 is a big one so I wanted to make sure there were not any "gotchas" and that all I needed to do was a switch version back to the inactive partition.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.