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 1.63 GB. This is a delta (partial) update that requires 7.0.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bd1515471aa35459af67f5edca02e6fa0c717030.zip.