iOS 12.0 (build 16A5288q) is an official Apple over-the-air update for the iPhone 6s, released on 2018-06-05T09:52:37Z. The update package is 1.17 GB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cc5a6cbc014120f445cc5f5367dd9ed73a939241.zip.