tvOS 9.2.1 (build 13Y772) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2016-05-16T16:44:18Z. The update package is 258.68 MB. This is a delta (partial) update that requires 9.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 81f1b7ef237f30cea9649ba0228db690db5d25b2.zip.