iOS 9.1 (build 13B5130b) is an official Apple over-the-air update for the iPhone 6+, released on 2015-09-30T17:58:12Z. The update package is 270.37 MB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1bc9cd9e6e74876a87b77b578cc134bc94f55e5d.zip.