iOS 8.2 (build 12D508) is an official Apple over-the-air update for the iPhone 4s, released on 2015-03-09T18:49:04Z. The update package is 821.98 MB. This is a delta (partial) update that requires 7.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5838e908689158976bee1e8ae6b285cd68c0170d.zip.