iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad 2 (Mid 2012), released on 2016-03-31T16:51:16Z. The update package is 254.95 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: 328c3970bb34152d16b2852ef5840eb045ffd6e3.zip.