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 173.65 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: 3e49e5c12567e1906b0398f6bda1c033d62b0bfe.zip.