iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-12-05T18:09:58Z. The update package is 1.45 GB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 38822fadea8711c4870d36887446ae3171404bf2.zip.