mt7711 Software/Firmware Version

... this is customer-owned equipment, so I know I will need to update this myself if there is a newer version. 

For modems and modem/router combination units like the MT7711, like it says at https://help.motorolanetwork.com/hc/en-us/articles/216091737-How-do-I-update-the-modem-firmware:

MODEMS and MODEM/ROUTER Combos:

All firmware updates are handled by the Internet Service Provider.  Motorola provides your Internet Service Provider with the firmware update.  Once it passes all their testing, they push it onto the customer's cable modem via the coaxial cable. 

There is no way for an end-user to update cable modem firmware manually.

You will sometimes hear, even from Comcast employees, that they do not update customer owned equipment, but that is incorrect. Their systems automatically update all modem and modem/router units, whether customer-owned or Comcast rental.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.