If you set your Apple TV 4K in Dolby Vision, the calibration will not work and tell you calibration is not required.

I don't set as Dolby Vision as the scrolling is not smooth at all.

I set it as RGB High SDR.

It is unnecessary set as Dolby Vision or HDR as the movie will auto switch to Dolby Vision or HDR when the film is Dolby Vision or HDR.

In RGB High SDR, scrolling is smoother and not stutter like in Dolby Vision.

The A14X I suspect maybe is Gaming Console. I predict Apple will out gaming console.

Anyway I already buy new Apple TV 4K, they is some changes like Fix Dolby Vision black crush issue (I hardly notice though).

Now hope I can get it by Today, now at KL Facility.