iOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 8 Plus (Global), released on 2017-12-13T18:10:52Z. The update package is 399.81 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c068384d5d96b97569d5376ab53226eebb508b7a.zip.