iOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPhone 5c (GSM), released on 2016-03-31T16:54:56Z. The update package is 19.48 MB. This is a delta (partial) update that requires 9.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 32bf1e65743d90b1b07bb4f1ba0faefc3012d5a6.zip.