tvOS 8.4.2 (build 12H864) is an official Apple over-the-air update for the Apple TV 3, released on 2019-07-22T17:04:55Z. The update package is 705.19 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: 47c6fd4ce5f1d77f8457c0399a2b6bf2f49a7556.zip.