mjantzer,
You can look at the webpage of the 5610 handset to get the firmware information.
Operation->Home
This web page provides IP-DECT stand information, including firmware version, MAC address, IP address, and the registration status of the handsets.
As for exporting the csv file that I am not sure if it can be done or not; personally I have never tried it.
Have you made sure that the phone doesn't have the in Hotel mode?
For hospitality environments, you can apply the following system behaviors by enabling the new Hotel Option setting in Telephony Settings page of the of the IP DECT web configuration interface:
Silent upgrades and resets
Disable call logging
Prevent phonebook modification.
As for the 5000 TFTP server that can be found on the 5000 via its web interface. I am going to go with the technicians don't want you in it if they told you they don't know about it.
I have uploaded contacts before a few years ago and it was a simple matter. I have not done it for a few years, but I doubt it has been removed as a function. Unfortunately we do not sell very many of these devices so I don't have a great deal of experience with them.
At this point if it continues to plague you then I would have your vendor open a ticket with Mitel Tech support.
Thanks,
TE