iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-10-30T17:16:03Z. The update package is 1.5 GB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9ed06516bbc35dd532191e692d59cdee132e9209.zip.