iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-10-30T17:15:56Z. The update package is 1.47 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: 88e9a5d4a282c695d4c04ba8971399c72c404a85.zip.