iPadOS 10.3 (build 14E277) is an official Apple over-the-air update for the iPad Pro 12.9-inch (WiFi), released on 2017-03-27T16:57:29Z. The update package is 716.57 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: 23f364143eea48c2227bf07d2319f9255f6140b3.zip.