iOS 8.1.3 (build 12B466) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2015-01-27T17:55:06Z. The update package is 247.8 MB. This is a delta (partial) update that requires 8.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 99755c5f3e0aa940f33da58236d638ef2a12a3bd.zip.