tvOS 10.2.1 (build 14W5578b) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2017-04-17T16:58:17Z. The update package is 24.66 MB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ad6713798fdc0812935673b68e9ad88b7b2e70c5.zip.