iOS 9.3 (build 13E237) is an official Apple over-the-air update for the iPhone 5c (GSM), released on 2016-03-28T16:52:32Z. The update package is 1008.03 MB. This is a delta (partial) update that requires 8.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cff833f69f06867fb632e19286702f8f96732af5.zip.