iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad 2 (WiFi), released on 2016-03-31T16:50:41Z. The update package is 825.58 MB. This is a delta (partial) update that requires 8.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ad609d0819f5a6e5fac28f57138cc6a4e5fe9dcf.zip.