iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2018-04-24T17:07:26Z. The update package is 31.45 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: f0bb157750042fcf8ad76f779c31b15488a46f71.zip.