iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2018-12-05T18:09:46Z. The update package is 1.48 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: 80e953a5d0b07c95aaa1bab2b1039fec976462fb.zip.