iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad Pro 2 (12.9-inch, WiFi), released on 2018-04-24T17:08:55Z. The update package is 1.38 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: c8ee18e4a4f9da593615588fc1097fc7bdfc4314.zip.