tvOS 8.4.2 (build 12H847) is an official Apple over-the-air update for the Apple TV 3, released on 2019-05-13T17:03:59Z. The update package is 705.17 MB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8c6615c410e08f6f405ed35931ba2ac492f84d13.zip.