iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad mini 3 (Cellular), released on 2018-04-24T17:06:46Z. The update package is 704.5 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: 1527a8becbf0632f3e21bc97041fede46e2c9459.zip.