iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad 2 (CDMA), released on 2016-03-31T16:51:07Z. The update package is 255.38 MB. This is a delta (partial) update that requires 9.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cd61fa589443e4719eef341d6f7198fb1789b45d.zip.