iOS 10.3 (build 14E277) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2017-03-27T16:58:21Z. The update package is 585.63 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: c820354646cc7ea783de1d594fcac19f26aa031a.zip.