iOS 9.1 (build 13B5130b) is an official Apple over-the-air update for the iPhone 6s+, released on 2015-09-30T17:58:14Z. The update package is 277.49 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: e5ca4a556b169f5d246bfa374e0b650f00b4c698.zip.