iOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPhone 5c (GSM), released on 2016-03-31T16:54:51Z. The update package is 952.63 MB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 386a619f6147a3ee7b61c4a7f32b602e38721785.zip.