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 494.83 MB. This is a delta (partial) update that requires 8.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 45b75d4e5df29a27129d24936d4e4fbc50b4f830.zip.