tvOS 11.4 (build 15L5546a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-04-17T17:02:51Z. The update package is 214.86 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: 5a635ec6c038f2ae169c1758081aff0515896e63.zip.