iOS 10.3 (build 14E277) is an official Apple over-the-air update for the iPhone 7 Plus (GSM), released on 2017-03-27T16:58:22Z. The update package is 624.97 MB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2c349866451f65db410b6aa493951a4fe27dca87.zip.