iOS 10.3 (build 14E5269a) is an official Apple over-the-air update for the iPhone 6s+, released on 2017-03-08T17:59:52Z. The update package is 438.28 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: 9685b2e4257a887850b0c0dd136977968cffe670.zip.