iOS 10.2.1 (build 14D15) is an official Apple over-the-air update for the iPhone 5s (GSM), 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: 28ee8dac0b7290b7c8561790e5d2ac03f829e6a2.zip.