I have mucked up my system to the point where I need to rebuild it ... but after many, many hours I've not had any luck figuring it out myself. I've looked through most of the "restore from default" type posts, but still can't make it happen.
I can start the system from the console, but can't connect through CCA.
I believe my flash is gone except for the IOS image (uc-500-advipservicesk9-mz.124-20.T2). I have a zipped UC500-7.0.2 and CCA 1.9.1 on my PC, but CCA won't discover the UC500. ( Even if it did, I'm not sure where to go from there. )
I'm a newbie ... just learning CLI, so please be pretty specific if you are able to help.
It might be smart to use CCA to restore the box to factory defaults since you did a copy to running-config rather than startup. When you copy to running, IOS merges the actual running config with whatever you are copying, which can result in some unexpected bits of configuration being left in place. If you factory default the box before starting to configure it, you eliminate any chance of that sort of leftover config coming back and biting you later.
Inside the 7.0.2 zip files is a bunch of factory default configuration files with names like UC520W-8U-FXO-K9-factory-7.0.2.cfg. Grab the file that corresponds to your hardware and load it into the UC500 nvram. Given that it sounds like the config is completely gone, the easiest way to do this might be to use a compact flash reader on a PC and copy the file onto the compact flash card. Then put the CF card back in the uc 500, get on the console, and enter the commands 'copy flash:UC520W-8U-4FXO-K9-factory-7.0.2.cfg startup' and then 'reload'. That should restore the box to the point where CCA can be used again.
Note that it is important to select the right config file for your hardware. So UC520W if it is a wireless box and UC520 if not; xxU where xx corresponds to the number of users supported by the box (8, 16, 24, 32, or 48); and xFXO or xBRI or T-E-x depending on the PSTN ports in the box. If you get the wrong file, then your results could be a little unpredictable.
Once you have been able to connect to the box with CCA, use the Maintenance > Software Upgrade tab to apply the 7.0.2 software bundle to the box and you should be good to go.
I think I've been in that boat, almost, but CCA was working for me.
I'm guessing also that a configuration, IP network etc... is still loaded on your UC520.
I would do a 'show flash' to show if the Operating System (OS) file is still loaded on your UC520.
That operating system file should be listed.
Also if you do a show run, hopefully the running configuration is running, i hope at least the IP address of the data vlan is present.
If you can do those commands, it means that your OS is running on the UC520.
You should be able to use CCA to create a new community, maybe called reload, with the seed address 192.168.10.1.
Then if possible use CCA to perform a software upgrade and use that zipped package file as the file to reload CME and well as maybe CUE.
i will monitor this site for updates, but it sure looks like if you get stuck, call your cisco TAC to give some guidance on software restore.