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 1.3 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: 4d184ef0426e9b624896f42261d49813e5bcb8c3.zip.