iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-12-05T18:09:56Z. The update package is 1.53 GB. This is a delta (partial) update that requires 11.0.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: fc5db635462b9d659f6aa17494cdddfdb362f24e.zip.