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 1.11 GB. This is a delta (partial) update that requires 8.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 385c4e2c472c2d473857a72b35664baa04cd5ec6.zip.