iOS 9.0 (build 13A344) is an official Apple over-the-air update for the iPhone 6, released on 2015-09-16T18:02:16Z. The update package is 1.12 GB. 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: 126a8ae0ee1c588175c6f3b925ea1fceb8c3e02c.zip.