tvOS 12.1 (build 16J5600a) is an official Apple over-the-air update for the Apple TV 4K, released on 2018-10-15T17:13:36Z. The update package is 1.59 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: eedbbf4631033c5569d830349a1967f08c50138a.zip.