iOS 12.0 (build 16A5362a) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-08-20T17:05:30Z. The update package is 159.15 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d0a49b308798cdb610b6581166b285be7fabe589.zip.