iOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2017-04-03T17:00:41Z. The update package is 761.17 MB. This is a delta (partial) update that requires 10.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c40a06f38db54268da98778d49c536a7ff8e77ed.zip.