iOS 10.3 (build 14E5277a) is an official Apple over-the-air update for the iPhone 5c (GSM), released on 2017-03-16T16:56:25Z. The update package is 258.51 MB. This is a delta (partial) update that requires 10.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 29c35862fb2a30bf7a724f61ea10e7b2fd94aed2.zip.