iOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2015-08-13T18:05:12Z. The update package is 1.18 GB. This is a delta (partial) update that requires 6.1.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: b05418a539a1b91fbfc56ea19863dacc88563d79.zip.