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 35.15 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: b063d8fff896024f5f006461ef8680425c604efb.zip.