iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad Pro 12.9-inch (WiFi), released on 2018-04-24T17:08:44Z. The update package is 31.82 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5d542471cffa959d030c91a946c98c047268809d.zip.