I have a samsung un55js700dfxza 2015 4k tv bought in feb 2016. Got a stick + 4k version from bestbuy. Works great. But I noticed something odd. I went to settings and display type. If I select 4K 30Hz T V it says 4k at 60 frames per second with a green check mark. And 4K content protection (HDCP 2.2) also shows a green check mark. And same for 4K 60Hz TV. Also same for 4K HDR 30Hz TV. Except a third green check mark for 4K HDR at 30 frames per second. But when I select 4K HDR 60Hz TV there is a red x at 4K HDR at 30 frames per second. Why is there a red x? If it can not do 30 fps that is fine. But under 30Hz option it says it can do 30 fps and under 60Hz option it says it can not do 30 fps. How odd. If it can not do 30fps then under either option it should show a red x. And also 30Hz should be 30fps and 60Hz should be 60 fps shouldn't it? Or is that not how it works?
I have a samsung as well. Look at your hdmi inputs. It seems on these “earlier” 4k TVs, not all of the hdmi inputs fully support hdcp 2.2. Mine also showed 4k 60 but the input I was plugged into wouldn’t actually do it. Your inputs should be labeled and in your manual it will tell you which inputs are capable of what. I just recently ran into this on mine and had no idea my 4k tv could only actually accept 4k from one of the 4 hemorrhage ports
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Also check your settings on your TV. I had to turn on HDMI color (or whatever they call it) if I wanted to see HDR. Also if you are using an audio receiver make sure it's settings are correct or it may not allow 60hz and HDR to display, only 30.
4K HDR TV: Samsung UN60KS8000 4K HDR Receiver: Yamaha RX-V381 4K HDR blu ray: Samsung UBD-K8500 4K HDR streamer: Roku Ultra 4640 (2016 model) 4K HDR Gaming: Xbox One X 4K HDR DVR: Directv Genie HS17-500 w/ C61K mini client Cables: Amazon Basics 18Gbps HDMI