tvOS 12.0 (build 16J364) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-09-17T17:12:58Z. The update package is 655.28 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: 00b366ccf97bcd281c515451837b4ed1c0673905.zip.