tvOS 11.4 (build 15L5560b) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-05-01T20:05:53Z. The update package is 57.75 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: 5052b71fa11b3558e16da0f0ee60d4b7ce3e89f4.zip.