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4K Ultra HD (UHD) and High Dynamic Range (HDR) on Xfinity TV
Enhanced 4K on Xfinity: What’s New and How to Watch
X1 TV Box equipment types - Xfinity Support
How to get a Xfinity 4k - XG1v4 Cable Box?
How to get a Xfinity 4k - XG1v4 Cable Box?
What is Xfinity Flex, and what does it offer? - Reviewed
Xumo from Xfinity (formerly Flex) FAQs - Xfinity Support
Xfinity TV and Internet Equipment Guide: Order, Upgrade, & More
Comcast To Launch 4K Ultra High-Definition Set-Top Box
Xfinity Launches Xumo Stream Box - Comcast Corporation