tvOS 11.4 (build 15L5576a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-05-14T20:00:15Z. The update package is 30.45 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: 823fae822ff66958e7c4779ec9593adc17b4a610.zip.