tvOS 12.1 (build 16J5593c) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-10-09T17:15:36Z. The update package is 138.14 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e92d0b2ec34749b65cc8836d512406aed4fad3dc.zip.