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 447.19 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: f328712f2b9207fa1e7e4615761fc91df7bc9118.zip.