tvOS 12.2.1 (build 16L250) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-04-10T17:06:49Z. The update package is 1.18 GB. This is a delta (partial) update that requires 9.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 302ad2b2015244cfa8dfc8763947698aaab04e5f.zip.