tvOS 11.4 (build 15L5560b) is an official Apple over-the-air update for the Apple TV 4K, released on 2018-05-01T20:05:53Z. The update package is 59.68 MB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4217d9705256b6b5fedfcf367d9ec45cafd07887.zip.