iPadOS 8.1 (build 12B410) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2014-10-20T17:59:05Z. The update package is 1.12 GB. This is a delta (partial) update that requires 7.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 68425979a70187d543eadf32e9a34fe33f7d41b1.zip.