iOS 12.0 (build 16A366) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-09-12T19:08:50Z. The update package is 1.55 GB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 92b4d4f014c85548408e66f144d8f8af6e2970e6.zip.