tvOS 12.1 (build 16J5602a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-10-22T17:17:00Z. The update package is 33.27 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: 9fbf1283783a630cb9f36d77177186b5b0075b82.zip.