iOS 12.1.1 (build 16C5036c) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-10-31T17:03:55Z. The update package is 407.99 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 74ff427666c0317d25679e7fffe8d12233542f80.zip.