tvOS 11.4 (build 15L5536c) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-04-03T17:09:48Z. The update package is 1.18 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 88a72635a80266475659aaf3c0942fb4d07953ed.zip.