iOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2017-12-13T18:11:59Z. The update package is 1.09 GB. This is a delta (partial) update that requires 10.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8dbaeeef3499eb0aaab5ae487b4ecca96d0a16af.zip.