iOS 9.1 (build 13B5119e) is an official Apple over-the-air update for the iPhone 6s+, released on 2015-09-23T17:55:10Z. The update package is 1.64 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5e6313d47d5f3e2493bded76a1e2999c12fea0b4.zip.