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 1.11 GB. 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: 511c6f415e1172b8e6bd6fe1531a7b5a8a9be4f9.zip.