iPadOS 8.1.2 (build 12B440) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2014-12-09T17:49:03Z. The update package is 382.22 MB. This is a delta (partial) update that requires 8.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c6b729c147264319580c7a17dad4437838c28547.zip.