iOS 9.1 (build 13B5130b) is an official Apple over-the-air update for the iPhone 6+, released on 2015-09-30T17:58:12Z. The update package is 1.56 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 299b0150263a59b4dcbcea226b182de614c4d145.zip.