iOS 12.0 (build 16A366) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-09-12T19:11:46Z. The update package is 1.44 GB. This is a delta (partial) update that requires 11.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8f35677636e768cc14278e18a4866b65b848db14.zip.