iOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPhone 6+, released on 2015-08-13T18:05:14Z. The update package is 665.93 MB. This is a delta (partial) update that requires 8.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 830403de452f34418f3f96fe2b8cefe35cd275df.zip.