Apple today released tvOS 15.2, the second major update to the tvOS operating system that first launched in September 2021. tvOS 15.2 comes more than a month after the launch of tvOS 15.1, an update that introduced SharePlay support.
tvOS 15.2 can be downloaded over the air on the Apple TV through the Settings app by going to System > Software Update. Apple TV owners who have automatic software updates enabled will be upgraded to tvOS 15.2 automatically.
Apple's tvOS updates are typically minor in scale, focusing on under-the-hood bug fixes, performance updates, and small tweaks rather than major outward-facing changes. We found no new features in tvOS 15.2 during the beta testing process, so it's not yet clear what's included in the update.
Apple does not provide detailed release notes for its tvOS updates, but it does offer some tvOS details through its tvOS support document.
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https://support.apple.com/en-us/HT207936
Also, what do you mean by "4K+"? The Apple TV hardware does not support a "+", nor was that ever promised.
Another quick check.....still no HDR for YouTube or YouTubeTV app. Content matching being totally on still kills Photos being able to play 4K+ content properly. Which, if it ever works as it's supposed to, is why 120hz mode is so important. As 120 divides frame rates evenly in to 24, 30, and 60.
ANYWAY....