iOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 7 Plus (Global), released on 2017-12-13T18:14:50Z. The update package is 58.58 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: ac6ec21b8ac86806ab30e2f49668feaa02d03c52.zip.