tvOS 12.1.1 (build 16K45) is an official Apple over-the-air update for the Apple TV 4K, released on 2018-12-05T18:09:00Z. The update package is 1.56 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: eb0d8f2bbac019833865df8007a2f3ed374c714f.zip.