iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2016-03-31T16:54:19Z. The update package is 328.7 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: 315a7372872a65fcb5c986214fc7eb7eb2308309.zip.