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 137.57 MB. This is a delta (partial) update that requires 8.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ef0eb806b4ca492ae1ac926d72192b2bc4cf0f14.zip.