iOS 9.1 (build 13B5136) is an official Apple over-the-air update for the iPhone 6s+, released on 2015-10-06T17:54:07Z. 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: 1678ab47c333ff9d1adb9d5ff45d263146663bd3.zip.