tvOS 12.1 (build 16J5602a) is an official Apple over-the-air update for the Apple TV 4K, released on 2018-10-22T17:17:00Z. 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: 9a045cac3b3c288f1ce3ea7c4a4989472c1ed831.zip.