iOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2015-08-13T18:05:13Z. The update package is 40.53 MB. This is a delta (partial) update that requires 8.4 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 74c46974bda8b8c507f0689c36c10a1ba7cae751.zip.