iOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPhone 6, released on 2015-10-21T17:16:05Z. The update package is 246.71 MB. This is a delta (partial) update that requires 9.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 523ff5cd3711adca0d0e6ad96b2cb1babb2dffd7.zip.