iOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPhone 6s+, released on 2015-10-21T17:16:06Z. The update package is 313.68 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0aa706940113160d78bc97b3a4293be3213670c8.zip.