iOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPhone 6+, released on 2015-10-21T17:16:04Z. The update package is 1.32 GB. This is a delta (partial) update that requires 8.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3f70507c47e59b6a2c0a7a1dd5764a68d59beb5e.zip.