iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad 4 (Global), released on 2016-03-31T16:52:32Z. The update package is 1.01 GB. This is a delta (partial) update that requires 8.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 21ebebc227b734936ac372c969edd40d80bc38ce.zip.