tvOS 8.4.4 (build 12H914) is an official Apple over-the-air update for the Apple TV 3 (2013), released on 2020-12-14T18:12:54Z. The update package is 15.84 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: ef9f96d125d6a1e8abc3fccfe8b16c1d7c6f9091.zip.