iOS 12.0 (build 16A366) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-09-12T19:11:47Z. The update package is 1.44 GB. This is a delta (partial) update that requires 11.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: efcc3597c42cc7ce66be91fc36b62d5e65a61837.zip.