iOS 10.3 (build 14E5239e) is an official Apple over-the-air update for the iPhone 6s+, released on 2017-02-06T18:02:15Z. The update package is 697.65 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: 5cb7a9bc2483e6cf7d65dfebfe02c74b2b99b990.zip.