tvOS 9.2.1 (build 13Y772) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2016-05-16T16:44:19Z. The update package is 50 MB. This is a delta (partial) update that requires 9.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c27d45fa0c8cf1bd47b52ba36749e8fa0634b085.zip.