iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-12-17T21:06:11Z. The update package is 1.55 GB. This is a delta (partial) update that requires 11.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cbfca72b689acd5c277428518fdb99f8e66ea03e.zip.