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 7.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e5a25e0189521f82129a6d982e69a8de3ded29fe.zip.