iOS 9.2 (build 13C75) is an official Apple over-the-air update for the iPhone 4s, released on 2015-12-08T18:04:00Z. The update package is 185.35 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: aeaef73d658d13c1b0c4d8b6fde8abcadad7222e.zip.