iOS 10.3.3 (build 14G5037b) is an official Apple over-the-air update for the iPhone 6s+, released on 2017-05-30T17:28:37Z. The update package is 57.3 MB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 24f1708a2d83f1c13565eea89bdf6aa3989f088e.zip.