iPadOS 8.1 (build 12B410) is an official Apple over-the-air update for the iPad 4 (GSM), released on 2014-10-20T17:59:06Z. The update package is 113.42 MB. This is a delta (partial) update that requires 8.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f64ce9c0cf7398d596695026c4ecd136770bfd1d.zip.