iOS 10.3 (build 14E5249d) is an official Apple over-the-air update for the iPhone 6s+, released on 2017-02-20T17:58:03Z. The update package is 301.61 MB. This is a delta (partial) update that requires 10.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 35c1fdc1c1089e061e094a0ae672ec3f6465f960.zip.