iOS 10.3 (build 14E5277a) is an official Apple over-the-air update for the iPhone 6s+, released on 2017-03-16T16:56:38Z. The update package is 446.89 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: 67b107564f694e47d3e85302733e6b435b11cdcb.zip.