iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-10-30T17:16:01Z. The update package is 1.54 GB. This is a delta (partial) update that requires 11.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f4a7ba57fd2568104a8f387a4ad7676fae58332f.zip.