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 585.64 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: ac6ec67bc93ae1db0a8d9e9e64daf15bb36c3dc1.zip.