tvOS 12.0 (build 16J5355a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-08-20T17:16:53Z. The update package is 654.57 MB. This is a delta (partial) update that requires 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c4375753647d48f506665771d0e6b95e4fb51c84.zip.