iOS 12.0 (build 16A5366a) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-08-31T17:07:35Z. The update package is 1.26 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: 410085b68e0b549139893a012dd43f4d1e970115.zip.