iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad Pro (10.5-inch, WiFi), released on 2018-04-24T17:09:14Z. The update package is 1.36 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 249568018a10387d112a031d67c2fc3ae7f4f574.zip.