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 1.02 GB. This is a delta (partial) update that requires 8.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3166813ac3e5b51cc704131d6e3d44a861a7106c.zip.