tvOS 13.3.1 (build 17K5792a) is an official Apple over-the-air update for the Apple TV 4K, released on 2020-01-14T18:28:57Z. The update package is 1.85 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: 7e10c9c3c9442d3f53985482f51c347c22641d5f.zip.