iPadOS 9.1 (build 13B5136) is an official Apple over-the-air update for the iPad 2 (Mid 2012), released on 2015-10-06T17:54:02Z. The update package is 965.44 MB. 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: 199287af8aca5b7c264468260c9deb52011f89c2.zip.