iOS 9.1 (build 13B5119e) is an official Apple over-the-air update for the iPhone 6+, released on 2015-09-23T17:55:09Z. The update package is 169.58 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: 42d5b13f0861b4b0bace2011ea1f41d32c6e905c.zip.