iOS 8.0 (build 12A4318c) is an official Apple over-the-air update for the iPhone 4s, released on 2014-07-07T17:52:06Z. The update package is 312.38 MB. This is a delta (partial) update that requires 8.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4218cd95dc056fea706b671031646bc14043d17d.zip.