iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad 2 (WiFi), released on 2016-03-31T16:50:44Z. The update package is 759.7 MB. This is a delta (partial) update that requires 8.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7744cd5596bd0d4128d6ffe7cfbee9b6b9950d44.zip.