iPadOS 9.9.11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad Pro 12.9-inch (WiFi), released on 2018-04-24T17:08:38Z. The update package is 1.41 GB. This is a delta (partial) update that requires 9.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 26d899eedac0537411f0e62722964c193ecad84a.zip.