tvOS 12.1 (build 16J5584c) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-10-02T17:18:56Z. The update package is 89.01 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7d6115dfbe9215b03829ff138b6e77440ac0446c.zip.