The P663 is one of the modems for Frontier's new bonded DSL service. It is deployed with a custom firmware that was tested with our bonded capable DSLAMS.
The 12M package is one of the Bonded packages. Did they deploy it bonded?
Probably from someone within the company. Frontier hasn't really offered firmware up for grabs on their support website. Firmware upgrades are normally done using the remote management backdoor found within the modem, so a roll-back may just result in another upgrade depending on Frontier's update policy.