tvOS 12.0 (build 16J5283n) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-06-05T09:51:34Z. The update package is 662.86 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: 08912958e7c33ba5d09dcfa3edbf70eea571795e.zip.