iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad mini 2 (Cellular), released on 2018-04-24T17:06:03Z. The update package is 1.23 GB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cf88bf98e69ad5e5be6696267dda208947707591.zip.