iOS 8.1 (build 12B407) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2014-10-07T18:06:08Z. The update package is 43.16 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: 8777536d2006dcd0e2087c08fcb4a5ec464cc5fd.zip.