iOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2016-01-19T17:59:51Z. The update package is 1.1 GB. This is a delta (partial) update that requires 8.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 788f9f8a65d5f944d69ecebfbd6c3f2f183eec54.zip.