Dan,
If you need follow up via email or phone, I would suggest that you open a TAC case. However here are a few links that will help you get the UC540 Software packs,
UC 500 Software Packs: General Info
https://supportforums.cisco.com/docs/DOC-9827
UC500 Software Download - Cisco Smart Business Communication Systems
https://supportforums.cisco.com/docs/DOC-9829
The software which is used to configure UC540 is called CCA. For the latest CCA software go here:
http://www.cisco.com/go/configassist
Just make sure that you get the right version of CCA compatible with your software version on the UC540.
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Posted by WebUser Asad Raza from Cisco Support Community App