iOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 8 Plus (Global), released on 2017-12-13T18:10:56Z. The update package is 66.14 MB. This is a delta (partial) update that requires 11.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 86ab14dc3d225a0a7282fb4ab64c10f793a40cc5.zip.