iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-10-30T17:16:02Z. The update package is 1.5 GB. This is a delta (partial) update that requires 11.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 350a4ff4940d0b186f9fb141c2466816899c6e50.zip.