tvOS 8.4.4 (build 12H937) is an official Apple over-the-air update for the Apple TV 3 (2013), released on 2021-09-20T17:13:23Z. The update package is 16.37 MB. This is a delta (partial) update that requires 8.4.4 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 21b53c2ce2ef163d0d2726cd72b54475eda5d865.zip.