iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad 2 (WiFi), released on 2016-03-31T16:50:46Z. The update package is 255 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: 100d6b4da85181b96ab5aac56a0fa6ea2457f5b4.zip.