iOS 8.1.3 (build 12B466) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2015-01-27T17:55:06Z. The update package is 1.29 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3bb35de93a371e1bd8e3c6741acacfa4b337764a.zip.