iPadOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2017-04-03T17:00:13Z. The update package is 565.23 MB. This is a delta (partial) update that requires 10.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 02453c04a19d654c82db5cb5b9e0f7b99c3e13c1.zip.