iOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPhone 5 (Global), released on 2016-03-31T16:54:45Z. The update package is 20.03 MB. This is a delta (partial) update that requires 9.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 021c2ff1f156d306f5e919a7d0951b9f2cab4fba.zip.