iOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2016-01-19T17:59:52Z. The update package is 292.17 MB. This is a delta (partial) update that requires 9.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e2950bbe09e86a73d620301f693669ee84cadb93.zip.