iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2016-01-19T17:59:39Z. The update package is 261.85 MB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 86cd6f414d93be880a2bfd4de5c154a6988471a3.zip.