Hi Nuno,
You will need CLI access to the UC540 for this. I'm assuming that it has a password, and that you don't know what it is. If you have the password, skip password recovery step.
First, to recover/set a new password, during boot you need to send a break within 60 seconds which will take you to Rommon.
At Rommon 1> type confreg 0x2142
At Rommon 2> type reset. Type no after each set up question.
When it boots, you'll want to erase cue (voicemail) first. Session into CUE with: service-module integrated-service-engine 0/0 session and hit enter twice. Type offline, then y when asked to confirm. Type restore factory default, and again y when asked to confirm, and press enter to reload. It can take 5-10 mins, and you will know its complete when it says system online.
Then to factory default the UC/CME, type exit to get out of CUE. At the prompt (which should still end in a #, if not, type enable to go from > to #) type show flash: Show more, and probably down at the bottom of the list you'll see something like UC540-xxxxxxx-k9-FACTORY-xxx-.cfg This is the factory config file (don't save to it!) Make note of this filename, I will refer to it as (but make sure you include the name and .cfg). Type copy flash: startup. Reboot, you should be running with a factory defaulted UC540.
Best,
Charles
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Source: https://supportforums.cisco.com/thread/2157974
Lost password go to http://www.recoverlostpassword.com
Lost password go to http://www.recoverlostpassword.com
