iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad 6 (Cellular), released on 2018-04-24T17:09:21Z. The update package is 94.39 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 385e36f06633a19c564608ee207e4cec31d11c83.zip.