tvOS 12.1.1 (build 16K5035b) is an official Apple over-the-air update for the Apple TV 4K, released on 2018-10-31T17:15:46Z. The update package is 1.6 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: eb7ef64c170b947528794698cf92943d14521cb5.zip.