iOS 10.2.1 (build 14D27) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2017-01-23T18:08:22Z. The update package is 333.93 MB. This is a delta (partial) update that requires 10.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 32bad3ffa10a6eccd00d82228c5dedbf9aa5fe5d.zip.