tvOS 11.4 (build 15L577) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-05-29T17:10:03Z. The update package is 960.06 MB. This is a delta (partial) update that requires 9.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a96c39ad5afb6b5e6237362f8658ba83d92bda31.zip.