iPadOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPad 3 (GSM), released on 2015-10-21T17:15:52Z. The update package is 891.29 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: f6c97f68c8b8c0c835c125602cd28d57818f3477.zip.