iOS 12.0 (build 16A366) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-09-12T19:11:44Z. The update package is 1.85 GB. This is a delta (partial) update that requires 10.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4e856c2af8511dfce128435aa0060967bb93aef4.zip.