iOS 8.1.2 (build 12B440) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2014-12-09T17:49:04Z. The update package is 129.27 MB. This is a delta (partial) update that requires 8.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 25c007daf97a1cd22a6af089629c8f6ec1228127.zip.