tvOS 12.1.1 (build 16K5035b) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-10-31T17:15:46Z. The update package is 98.82 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 050d72a2703fc37d142773819cdfa1c8f1d02694.zip.