iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad Pro 9.7-inch (WiFi), released on 2018-04-24T17:08:23Z. The update package is 593.76 MB. This is a delta (partial) update that requires 11.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1bba86a130b7ece7c92fd3176d8ae55de75a2713.zip.