iOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 7 (Global), released on 2017-12-13T18:14:36Z. The update package is 391.67 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: 9c70d77680fd782261d22946b72c54e51a88df28.zip.