iOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPhone 6+, released on 2015-08-13T18:05:15Z. The update package is 225.91 MB. This is a delta (partial) update that requires 8.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: df1d0f99a8c5b0591bc2fdd39622360dd0192a2b.zip.