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 1022.77 MB. This is a delta (partial) update that requires 8.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d4ec1ad047bbfb9921e4a0b0f513bb9d2bf367f1.zip.