iOS 12.0 (build 16A5366a) is an official Apple over-the-air update for the iPhone 6s, released on 2018-08-31T17:07:34Z. 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: c9bd922cb6cd97b16eafac31778b6e02cc27eae0.zip.