tvOS 11.3 (build 15L6211) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-03-29T17:05:08Z. The update package is 1.17 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: d5b50c34ff3f142d3d33e5600cd037d7b0919bdc.zip.