iOS 9.0 (build 13A344) is an official Apple over-the-air update for the iPhone 6, released on 2015-09-16T18:02:17Z. The update package is 1.02 GB. 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: cb2869a56f0b4a8bbd9eb6cfcbb92e4cea371ae4.zip.