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 135.28 MB. This is a delta (partial) update that requires 12.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b07df2a98ed3dc0a003ed346b096232b120e8f4e.zip.