tvOS 12.3 (build 16M5129d) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-04-08T17:20:50Z. The update package is 1.38 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: 3ef6ec703639923814a8e9854c4430a1e69132eb.zip.