iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2016-03-31T16:54:18Z. The update package is 447.21 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 649c0adb7478cf18a9dc8d4e381f9a174f216839.zip.