iOS 10.3 (build 14E277) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2017-03-27T16:57:36Z. The update package is 385.76 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: caceec68e3319f7fc6c4725c0f6f1ff55163533d.zip.