iOS 9.2 (build 13C75) is an official Apple over-the-air update for the iPhone 4s, released on 2015-12-08T18:03:59Z. The update package is 819 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: 1a3e5738f28a992416539095ffe14e6e3becfc2e.zip.