iOS 9.3 (build 13E5225a) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2016-03-01T18:13:41Z. The update package is 114.35 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: 3054e075d97d7d7d98c4df45168055a4943179b5.zip.