iOS 11.2 (build 15C114) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-12-02T08:13:01Z. The update package is 315.12 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: 4239c87827f307f686b67b696afe64196ec67646.zip.