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Seems that when you are upgrading the UC520 software via CCA, you need to turn off AAA via tacacs to make the upgrade work. I had problems with an upgrade on an UC520 that uses tacacs+ for level 15 authentication, and I couldn’t upgrade the box, even if http auth was set to local, until I had turned off tacacs for level 15 access.
Also CCA needs to be running on an XP box for CUE upgrade to work.
I was running CCA version 1.8 and upgrading to UC520 7.0.1-EA