tvOS 13.3 (build 17K449) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-12-10T18:33:05Z. The update package is 1.24 GB. This is a delta (partial) update that requires 10.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f229b1a76a4086480b91484d6f314f46335a2bab.zip.