iPadOS 9.1 (build 13B5130b) is an official Apple over-the-air update for the iPad 2 (Mid 2012), released on 2015-09-30T17:58:03Z. The update package is 965.11 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: 11b75b1b1ac0ddb93e65111986632756379bcae2.zip.