iOS 9.3 (build 13E237) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2016-03-28T16:52:22Z. The update package is 998.44 MB. This is a delta (partial) update that requires 8.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b417eb2499a47759692587a26ed8e529a00d5f3b.zip.