tvOS 12.3 (build 16M5117f) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-03-27T17:14:27Z. The update package is 102.02 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: ee4ce9d3489737ea73a25254f7389b2f0e8a4786.zip.