iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad Pro (10.5-inch, WiFi), released on 2018-04-24T17:09:15Z. The update package is 725.88 MB. This is a delta (partial) update that requires 11.0.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 140a60a5488a7997f4c0fa3e0c9c20d46f1c3695.zip.