tvOS 12.3 (build 16M5151a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-05-07T17:18:22Z. The update package is 1.37 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: bbc57c0057de72140640429d10fd3f0af7d0aed0.zip.