iOS 12.0 (build 16A5354b) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-08-13T17:04:00Z. 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: 0f30788bc674c5ce0c8f39a1515e5c6bf54f6a0d.zip.