iOS 12.0 (build 16A5362a) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-08-20T17:05:29Z. The update package is 1.26 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: 38abb5e64354232cd6ddd99b6b887cd3e0b6fae3.zip.