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Thx. Just found out my installer gave me garbage that won't display 4k. I appreciate your help.
other than special events (some sport, some Olympics) the X1 subscription is for 720p for cable channels and whatever your local channels have (720p, 1080i, SD). an Xg2 is not a DVR. the xg1v4 is a 4k DVR, if you have an xb3/xb6,xb7 Xfinity gateway then you can use an xi6 companion wireless set top box for 4k on apps like netflix.
Have you contacted Comcast about getting a different box that will allow you to watch cable programming in 4K? I have been wondering for months why the picture on my tv isn't nearly as good as other tv's I have seen and I just found out a couple days ago that it is because the cable box isn't capable of 4K. I tried chatting with an agent to see if I could exchange the box but they said I would have to call and talk to a sales agent. I'm trying to avoid doing that because it usually ends with me wanting to reach through the phone and strangle them.
I was never given a choice of the type of cable box. They just sent me one in the mail and I set it up. I never even knew there was a different box for 4K until a few days ago.