tvOS 12.3 (build 16M5151a) is an official Apple over-the-air update for the Apple TV 4K, released on 2019-05-07T17:18:23Z. The update package is 1.57 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: 2e6fddd57dfe313368220dd43d705a931c25d51e.zip.