iPadOS 8.1.3 (build 12B466) is an official Apple over-the-air update for the iPad 4 (Global), released on 2015-01-27T17:55:04Z. The update package is 468.79 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: fec8bd600b8cb4c80e2d6a307054bb3b50c49125.zip.