iPadOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPad 4 (GSM), released on 2017-04-03T16:59:43Z. 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: d25a9f5aafb61ccbddb3c2aa371dfc255b9d9884.zip.