iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-12-05T18:10:04Z. The update package is 1.5 GB. This is a delta (partial) update that requires 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 447acc2a80fd8217be7949909e2e62dab1ebdb1e.zip.