tvOS 8.4.2 (build 12H864) is an official Apple over-the-air update for the Apple TV 3 (2013), released on 2019-07-22T17:05:50Z. The update package is 16.41 MB. This is a delta (partial) update that requires 8.4.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e5595f03471329e30489f4c62d0aed7561cf1472.zip.