I have a series 2 Tivo and was using the serial cable to change channels on a Motorola cable box until today when the Motorola died. Comcast gave me a new xfinity/cisco RNG100 cable box which has no serial port. I tried to set up the IR blaster but when I go into the tivo messages and settings > settings >channels > channel changing > The Menu asks if I'm still using the motrola box so I select no I've changed cable boxes and it gives me a list of 90 some cable box brands but does not include Xfinity or cisco. Help! what do I do now????