iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad Pro 12.9-inch (WiFi), released on 2016-03-31T16:54:25Z. The update package is 271.93 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: ddbb0298dcb59f86c5da613ed04992d7bcc222eb.zip.