tvOS 12.1.1 (build 16K5041a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-11-07T21:15:50Z. The update package is 160.99 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 37559b9a6eec341b7eeb55c0d42781f169dfefc0.zip.