Yes, HDMI 2.0/HDCP 2.2 is a 4K requirement. Your player will still work fine for 1080 or lower content. I had my Ultra 4640 connected to an older 1080 plasma set and had no issues. I could even watch 4K material, but of course the Roku sent it to the TV as 1080. Makes HDR content look terrible, but it's still viewable.
However (ya knew that was coming) some of the early TVs with HDMI inputs will not accept 1080p video, and the Roku does not support 1080i. It does support 720p, and most of those TVs will also accept 720p. But there are a handful of early HDMI sets only accept 1080i or 540p via the HDMI jack, and the Roku supports neither resolution.
Dan
Roku Community Streaming Expert
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