iPadOS 9.0.1 (build 13A404) is an official Apple over-the-air update for the iPad 4 (GSM), released on 2015-09-23T17:55:18Z. The update package is 959.13 MB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6908c89b637b13545472c42bbf53da7b26402550.zip.