tvOS 12.2.1 (build 16L250) is an official Apple over-the-air update for the Apple TV 4K, released on 2019-04-10T17:07:00Z. The update package is 308.47 MB. This is a delta (partial) update that requires 12.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 97fe9d71a35164fbb1080229b5044e87fe028486.zip.