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 725.24 MB. This is a delta (partial) update that requires 11.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a28813da554c19329662fe491cc44733b3356727.zip.