OK I dug out my MX450 and I did have it set to code 0195 and it works fine using IR with my xfinity boxes. I have both a RNG150N and a XG1. Have you been able to get the remote working with direct IR?

Have you verified that your xfinity remote works when in IR mode (since you unpaired the remote)?

I then configured my MX450 to my MRF350 still using code 0195 and it also worked fine.

Maybe something else is wrong. I don't see a RNG150N made by Cisco on Comcasts website, those are made by Samsung or Pace depending on the model..

Cisco makes the XiD X1, haven't seen one of those yet.