tvOS 8.4.4 (build 12H923) is an official Apple over-the-air update for the Apple TV 3 (2013), released on 2021-04-26T17:13:35Z. The update package is 29.35 MB. This is a delta (partial) update that requires 8.4.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 92554f389831646b333d93ad4dc6b389fe223194.zip.