iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad Pro 9.7-inch (Cellular), released on 2018-04-24T17:08:33Z. The update package is 1.22 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 357e5c2d4d9cdde3201762974aa8cb314c7a7c1f.zip.