tvOS 13.3 (build 17K5440a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-11-12T18:14:57Z. The update package is 108.7 MB. This is a delta (partial) update that requires 13.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5c9a2021ab7394060ffdec4a013983568ebbcafe.zip.