problem with 4k hdr blu-ray

Since my TV does not support HDR, I cannot activate it and it is disabled by default.

As I really like Interstellar, it was offered to me in 4k without knowing that I do not have a 4k TV.

What I mean is Xbox series X has a very dark image with HDR blu-ray. But when I watch HDR blu-ray on my PS5 I have no problem.

I think Xbox series x is not converting HDR to SDR correctly but that the ps5 yes.

On the other hand, blu-ray 4k comes out very well on a 1080p TV.

Of course, disabling HDR defeats the whole purpose of purchasing 4K HDR Blu-Rays.

...and 4k blu-rays. watched BvS and Deadpool this week w/ 4k hdr - stunning.

I am having the exact same problem. With HDR enabled, my 4K UHD version of the Revenant has stuttering and dropped frames. With HDR disabled, it plays flawlessly. Auto brightening is off, I don't have 50hz enabled (it's grayed out). I do have 24Hz enabled.
Disabling 24Hz, with HDR enabled, creates a washed out, almost colorless picture.

Also, I have tried two different brand new 4k UHD Blu-Ray Revenant discs (first one was exchanged at the store). My XBox Blu-Ray player plays standard Blu-Rays flawlessly, with HDR enabled, with no stuttering. So, it's not the player, and it's not the disc.
The problem occurs playing 4K UHD Blu-Rays, with HDR enabled. I also have the latest version of the app, and my Vizio P55-C1 firmware is up to date (it updates automatically).

Hi guys i have just bought a dolby atmos sound bar but now the 4k blu ray says no hdr device.

The picture is much worse as minus hdr but the sound is very decent.

My set up is

tv 55 sony xe90

xbox one S

sony ht xf9000 dolby atmos virtual surround bar and sub woofer

+ 4k blu ray.

all cables 2.0 hdmi.

Any ideas why now it wont play 4k blu ray in HDR?