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 1.18 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: 55909a860ce7053d0cba89e50ee9a4370783b9fa.zip.