iOS 12.0 (build 16A5362a) is an official Apple over-the-air update for the iPhone 6s, released on 2018-08-20T17:05:28Z. The update package is 1.21 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: 59c4b331aa53d50d1df0b4c7589f5dc3f3706eec.zip.