iOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2015-08-13T18:05:14Z. The update package is 504.27 MB. This is a delta (partial) update that requires 8.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 60493ed34d373b9051d7a0ff5b4ff127b27e424d.zip.