iPadOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPad 2 (CDMA), released on 2015-10-21T17:15:48Z. The update package is 812.2 MB. This is a delta (partial) update that requires 8.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a519ea08c9ee0b6d20546c94065f154db917b1f3.zip.