tvOS 11.4 (build 15L577) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-05-29T17:10:06Z. The update package is 834.17 MB. This is a delta (partial) update that requires 10.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 24aec3dde4f803f0e2ecbbe7c85585fd2241fed5.zip.