iOS 10.3 (build 14E277) is an official Apple over-the-air update for the iPhone 6s+, released on 2017-03-27T16:58:19Z. The update package is 617.73 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: cae3628a0ad449667f4b4ecd7bb1dbb7a8cdd3c7.zip.