iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-12-05T18:09:59Z. The update package is 516.26 MB. This is a delta (partial) update that requires 12.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7cf9810a04e198a5b1b7a708f23dc178c0660446.zip.