iOS 10.3 (build 14E277) is an official Apple over-the-air update for the iPhone 5c (GSM), released on 2017-03-27T16:57:48Z. The update package is 385.91 MB. This is a delta (partial) update that requires 10.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c13e06ba5d99fe0ab7549cc382029f687bb5d882.zip.