Ran into the first of these last week and it burned a whole bunch of my time. It is the new Xfinity box that currently records 4 channels and is later going to do 6, with whole house DVR capability. I am sure I will be seeing more of them.

Didn't see any codes in URC or MegaList that worked. I began learning them into URC MX880, but five codes would not learn at first. Tried the RTI learner, and NONE of the codes worked after downloading. Went back to the 880 for learning. Had to press the oem remote button then bring the remote into learning position to get them to work.

Each button ultimately worked, but I found the favorite macros would work several in a row, then a few more tries would have digits that repeated, killing the macros.

I am not a "hex-pert" so wondered what you would do with such codes. Do you call them good because the individual buttons work fine? Do you examine them for anomalies in the hex codes that can be cleaned up?

After 20 years of Comcast boxes working 100% reliably, I am hoping this is not a new (bad) day for integrating these boxes.

If you can post Pronto Hex or RTI learns, I'll be glad to see what we can figure out about the structure.  Then we should be able to make "clean" codes.  Actually I expect these codes are XMP, and we just have to figure out the device and function numbers.

Does it matter that ZERO of the RTI learns worked?

I've never had that happen.

Yes, we have a better chance with learns for which some worked.  Can you get that out of the MX880?

Working on this too.
RTI has been no help so far.
Pace the OEM told me they're using XMP protocol
Just had them installed in my own home.
the RNG200 tweak codes sort of work
I've been putting the XR2 in RF mode for now
Real pain in the A$$
Thanks Comcast

A reasonable expectation is that these new boxes use the same IR protocol (XMP), with the same device numbers and function numbers as the RNG boxes.

If the RNG IR signals "sort of" work, that implies that the protocol, device and function numbers are the same.  XMP does send a two part signal, and many implementations that we see here only send one of the two parts.  Perhaps the new boxes require both parts.   

So, what is a "tweak code"?  Can you provide some learns, especially one or two that work?

Don't think hex comes out of CCP. So I have a semi working URC plus RTI codes that do not work at all. I will mess with RTI again later.

Try the Comcast/Motorola codes and urc emitter not 3.5mm jack in back

URC cable code 195 may help. Turn repeats to 1 on numeric to see if your FAVS will work without double firing digits.

May still get double firing - if you want a favorite, start it with EXIT so you can resend the favorite if it gives you 4 or 5 digits.

I ran into these boxes as well. IR wouldn't learn reliably. I though they were using toggle bit ir codes. Any updates on IR codes?

None of my jobs get these new boxes until thats fixed.

What's your control system? The URC code is workable...

Turn off repeat while... and set repeat to 1. Good luck on favorites.