tvOS 11.3 (build 15L5198d) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-03-05T21:06:46Z. The update package is 103.69 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a1821fe4518b541661a417b909c83b6187c68359.zip.