iOS 8.1 (build 12B5411) is an official Apple over-the-air update for the iPhone 6+, released on 2014-10-20T17:59:02Z. The update package is 2 GB. This is a delta (partial) update that requires 8.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d3e8e10a7de8fcd83ee5646c2da509043e208b00.zip.