iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad 3 (WiFi), released on 2016-03-31T16:51:49Z. The update package is 196.78 MB. This is a delta (partial) update that requires 9.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 420c7a4e2810015d35352ebc8912d3645ea1cc2e.zip.