iPadOS 9.1 (build 13B5130b) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2015-09-30T17:58:06Z. The update package is 1.17 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2f1efc383fe1e274358be79c085a87c452234058.zip.