iPadOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2017-04-03T16:59:47Z. The update package is 534.7 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: d44fbe8bc22c010566a2fa6d863d5bd55f925649.zip.