iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-12-05T18:10:05Z. The update package is 398.79 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: 90dd0233c719487118be498ca72c9d0191b26b26.zip.