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 717.4 MB. This is a delta (partial) update that requires 10.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0042bbc98c89eea9ccce7be4d4ef836428b4406f.zip.