iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2016-03-31T16:52:39Z. The update package is 418.9 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: 88d2cf70f8e31dca355b4e525505a50ccbd21c59.zip.