tvOS 14 now available for your Apple TV: deeper HomeKit integration, 4K YouTube, Picture-in-Picture - 9to5Mac
tvOS 14 doesn't support 4K YouTube playback yet
tvOS 14 Brings Apple TV Support for AirPods Audio Sharing and Watching YouTube Videos in 4K - MacRumors
YouTube TV Is Rolling Out a 'Major Update' For the Apple TV
New Apple TV 4K supports high frame rate HDR in YouTube app | AppleInsider
6 Best Fixes for YouTube Not Playing 4K Videos on Apple TV 4K - Guiding Tech
Apple TV gets YouTube playback in 4K with tvOS 14 | AppleInsider
Apple Releases tvOS 14 With Picture in Picture, 4K YouTube Videos, HomeKit Secure Video Integration and More - MacRumors
Apple tvOS 14 User Guide: The Complete Illustrated, Practical Guide with Tips and Tricks to Maximizing the New tvOS 14: Linton, Eric: 9798689689586: Amazon.com: Books
Jailbreak Apple TV 4K: How to Install USB Breakout for tvOS 13 - 13.3 Jailbreak! (iOS 13 DFU Setup) - YouTube
Buy Apple TV 4K - Apple
Apple TV 4K will finally support 4K YouTube videos with tvOS 14 update - Neowin
tvOS 14 brings support for streaming YouTube in 4K on Apple TV - 9to5Mac