iOS 9.0.1 (build 13A404) is an official Apple over-the-air update for the iPhone 6+, released on 2015-09-23T17:55:24Z. The update package is 1.3 GB. This is a delta (partial) update that requires 8.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 24424f362701aecd138724604f3ee1acebb28614.zip.