iOS 9.1 (build 13B137) is an official Apple over-the-air update for the iPhone 6, released on 2015-10-12T16:56:57Z. The update package is 1.35 GB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ffff1b3044733214ddde4c486a1adb1572988102.zip.