iOS 10.3.2 (build 14F5089a) is an official Apple over-the-air update for the iPhone 6s+, released on 2017-04-27T16:59:03Z. The update package is 575 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: db8643adb996d7de97ed1b00b6484a839bdcb1fa.zip.