tvOS 12.3 (build 16M5146a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-04-29T17:44:37Z. 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: 118af9a482c0cf7a8f6a83e1355762fc34056c07.zip.