iOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2016-01-19T17:59:42Z. The update package is 189.56 MB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5aff3a1866bb37471ed6380c7e117d7540011569.zip.