iOS 12.0 (build 16A366) is an official Apple over-the-air update for the iPhone 6s, released on 2018-09-12T19:11:27Z. The update package is 1.35 GB. This is a delta (partial) update that requires 11.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5b66cad23679119b9d16f14d01db2847b64fc834.zip.