iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad Pro (10.5-inch, Cellular), released on 2018-04-24T17:09:19Z. The update package is 696.65 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 61fa9cf2b59bc04bce8500be3e62c696f38fe5ad.zip.