iPadOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPad mini 2 (WiFi), released on 2015-10-21T17:15:55Z. The update package is 1.1 GB. This is a delta (partial) update that requires 8.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 14efa76251630c9f676e5a0a44722306e35bd1de.zip.