iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad Pro (10.5-inch, Cellular), released on 2018-04-24T17:09:18Z. The update package is 1.36 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: 21a3b6e8afc618aca7b9167ecef8e39700d5e2cd.zip.