tvOS 12.3 (build 16M153) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-05-13T17:19:30Z. The update package is 1.08 GB. This is a delta (partial) update that requires 9.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8345594004a79e78dc066e5e66102ce0f518ddf1.zip.