iPadOS 8.1 (build 12B410) is an official Apple over-the-air update for the iPad 4 (Global), released on 2014-10-20T17:59:06Z. The update package is 1.14 GB. This is a delta (partial) update that requires 7.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4095c0030e8c2dc1b5281b621ed7c19da9ab3798.zip.