iOS 8.1.3 (build 12B466) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2015-01-27T17:55:05Z. The update package is 136.38 MB. This is a delta (partial) update that requires 8.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 23324c1fd837c9836b4a38a61b1353b4e5f0d1c4.zip.