iOS 10.2.1 (build 14D15) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2016-12-20T18:02:31Z. The update package is 58.61 MB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e3065def069dba0292cc42a804ec3304ef3192e4.zip.