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 112.01 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: 93afc27aaa7791361995a79aaec30cf85b6b7637.zip.