iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2018-10-30T17:15:35Z. The update package is 1.5 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: c67becddb94cfe7d6b9f71f97105488c69c53488.zip.