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 69.39 MB. This is a delta (partial) update that requires 8.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c6f8e4b709e377978122fd8e3a2aa58f040bcec0.zip.