iPadOS 9.1 (build 13B5136) is an official Apple over-the-air update for the iPad 2 (WiFi), released on 2015-10-06T17:54:02Z. The update package is 965.51 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: 3b13d59299afcfe85a4347cd9316430860b7aa95.zip.