iOS 8.1.1 (build 12B435) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2014-11-17T18:06:06Z. The update package is 64.5 MB. This is a delta (partial) update that requires 8.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 74413dd5ac78b16efaac67898857c56f576fa26f.zip.