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 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 952fb6bc3b419d1d050de2126c9f0868aff2fca7.zip.