iOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPhone 6, released on 2015-10-21T17:16:05Z. The update package is 1.11 GB. This is a delta (partial) update that requires 8.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c212a6b3ebc2d2d042cd02f990e2214e8f5d544e.zip.