iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad Pro (10.5-inch, Cellular), released on 2018-04-24T17:09:20Z. The update package is 604.73 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: 26cd2673db507ef47f6d5308e55a7e42ba891364.zip.