Appreciate the response. Unfortunately, no joy. I've put the file on an HTTP server and a TFTP server, but when I click the Download Firmware button, it responds with the "Unable to upgrade firmware" response almost instantly. I was able to monitor the Open TFTP server on my laptop, and it did show that there was some sort of communication with the 6940, because it showed the IP address of the phone and the word "Timeout". It almost feels like the capability to download firmware has been disabled somehow. I hope that's not the case.