tvOS 12.2 (build 16L5221a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-03-11T17:15:41Z. The update package is 58.11 MB. This is a delta (partial) update that requires 12.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 75d311ebeac5ed67d24affa7c19648ec63586f82.zip.