iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad Pro 9.7-inch (Cellular), released on 2018-04-24T17:08:26Z. The update package is 1.25 GB. This is a delta (partial) update that requires 10.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1590de135b45d9d5573b4786202a76d6d6d495a8.zip.