i just purchased a Hisense 55 inch 4K TV and I can’t get the Apple TV to accept that it has HDR. The model number of the TV is 55H6D. I think I covered all of the bases. Bought a Monster 2.0 HDMI cable made for 4k sets. I did a firmware upgrade on the TV when I first installed it. I turned on the 2.0 mode on the TV for the HDMI ports and I made sure to plug in to the HDMI ports that support 4K. When I go on the Apple TV and try to turn on HDR the Apple TV does it test and I get a message on TV that I have a weak signal. Then some colorful images come up on screen and finally the Apple TV reports that HDR was not working and that I may need to change my color settings to get it to work.... Anything else I can try. I have new cables coming from Amazon tomorrow and will try them. Returning the Monster cable. $40 is nuts for a cable. I am also running the public beta of TV OS. Any help would be appreciated.