iOS 12.0 (build 16A5318d) is an official Apple over-the-air update for the iPhone 6s, released on 2018-07-03T17:05:39Z. The update package is 1.13 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: 0fb6f1618289908b8b4f1dfea9eab5cb89d58668.zip.