iOS 8.1 (build 12B411) is an official Apple over-the-air update for the iPhone 4s, released on 2014-10-20T17:59:07Z. The update package is 113.24 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: 17376e54f48f89b50c5c8eeb82ed485b70dd8c37.zip.