iPadOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2017-04-03T16:59:40Z. The update package is 362.67 MB. 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: 70809f08113d28b982bbb9d0798a7ea0aa20aaad.zip.