tvOS 12.1 (build 16J5600a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-10-15T17:13:37Z. The update package is 44.48 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: edc3b34f91a59e37b003c0e6468ff2904f2ca1a8.zip.