iPadOS 8.1 (build 12B407) is an official Apple over-the-air update for the iPad 4 (Global), released on 2014-10-07T18:06:05Z. The update package is 42.06 MB. 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: 0cd96e2671155a1cb2f2e9145d4762aef79ea00c.zip.