iOS 9.3 (build 13E5181f) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2016-01-14T18:01:21Z. The update package is 20.59 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: 46b4c76140e9e42d0c007e248df652fee3f35d42.zip.