iOS 11.2 (build 15C114) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2017-12-02T08:15:11Z. The update package is 390.89 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: 52be3ac0423db3b6e9832422ca36dc892ff5e43c.zip.