iPadOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPad Pro 9.7-inch (Cellular), released on 2017-04-03T17:00:14Z. The update package is 551.5 MB. This is a delta (partial) update that requires 10.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d41408491d42634807d827c31e0da45380d4942c.zip.