iOS 12.0 (build 16A5327f) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-07-17T17:06:15Z. The update package is 1.2 GB. This is a delta (partial) update that requires 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: dacf1fbdd7419843f23043bdb98adecf5077c578.zip.