iOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 7 Plus (Global), released on 2017-12-13T18:14:48Z. The update package is 397.28 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: f5e4a6da12fd2f21bd2c512434b0a26f98d12071.zip.