iPadOS 9.0.1 (build 13A404) is an official Apple over-the-air update for the iPad 4 (GSM), released on 2015-09-23T17:55:17Z. The update package is 1.02 GB. This is a delta (partial) update that requires 8.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: dc3334cdac7dd503f5c10216d2e1571d793363fe.zip.