iOS 9.0 (build 13A4325c) is an official Apple over-the-air update for the iPhone 6, released on 2015-08-06T18:44:17Z. The update package is 337.1 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c4964e25aa9ef8b734970413c4012708ce667dec.zip.