tvOS 8.1.3 (build 12B466) is an official Apple over-the-air update for the Apple TV 3 (2013), released on 2015-01-27T17:55:03Z. The update package is 111.86 MB. This is a delta (partial) update that requires 8.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: dac88a4c70a8496c1c1d4242dc440c817d776bea.zip.