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 810.31 MB. This is a delta (partial) update that requires 8.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cb554c3ddf373bc26b26f15a1e987a2d996843fa.zip.