iOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 8 Plus (Global), released on 2017-12-13T18:10:51Z. The update package is 399.78 MB. This is a delta (partial) update that requires 11.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b103ffabb66b0a035bb59f9fd6411401b1621278.zip.