tvOS 6.1.4 (build 10B809) is an official Apple over-the-air update for the Apple TV 3 (2013). The update package is 614.54 MB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c31fd8cabc63c0b0c13d6e450fcb039c8d1d192e.zip.