iOS 8.0 (build 12A365) is an official Apple over-the-air update for the iPhone 4s, released on 2014-09-17T17:54:03Z. The update package is 1.6 GB. This is a delta (partial) update that requires 6.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c095f1ebcb9cf02b270e06507a0626ea8affee02.zip.