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 1007.01 MB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d0c5ef5dceaa0018d8857f5e5702744ccf414faf.zip.