tvOS 12.3 (build 16M5146a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-04-29T17:44:36Z. The update package is 52.83 MB. This is a delta (partial) update that requires 12.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b48a6a8764db25703720ac5e0358c55fd70c8986.zip.