iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2018-12-05T18:09:47Z. The update package is 396.43 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: f608e4f6eb8643c0ed75544e680ed158d8ec7f8e.zip.