iOS 9.2 (build 13C75) is an official Apple over-the-air update for the iPhone 4s, released on 2015-12-08T18:03:58Z. The update package is 894.64 MB. This is a delta (partial) update that requires 8.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5c9b6f31025726d28afe08c09ce7ae781c69436c.zip.