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: 48a0079a3de5baf32f49e2e4a110d417bb824a6d.zip.