Can no longer login to my CM2050V purchased modem

Hello.

I've been using a Netgear CM2050V modem that I purchased a little over a year ago for use with Comcast without issue. When I got it, I changed the login password, as the default password was "admin". Now today I am no longer able to log in. I have tried the password that I have been using the past year, and even defaut admin password, but it doesn't work. I have also powered the modem off and back on, and also pressed the Rest button for 30 seconds on the back for the modem to reboot. But nothing I do will allow me to login. I like to login once a week to check the modem's signal levels and if there are any uncorrectables. 

I posted this on the Netgear help site and was told that maybe Comcast pushed a new firmware that disables users from logging into their own CM2050v modem, as this happened on some Motorola modems.