iOS 12.0 (build 16A5354b) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-08-13T17:03:52Z. The update package is 1.35 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: a4f1a7ec5253da6cab19ad5c9bc1d29a937818ad.zip.