tvOS 12.1 (build 16J5602a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-10-22T17:17:00Z. The update package is 138.47 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cfc403be519d8d906947fdb54ab4cf7e89b060f9.zip.