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 1.53 GB. This is a delta (partial) update that requires 11.2.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: af9e2ce970d1f87066aa1b87006b0386d7f892a9.zip.