iPadOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPad mini 3 (Cellular), released on 2015-10-21T17:15:57Z. The update package is 1.1 GB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 184c0954f1900d5e7d04352bf2b8d0839905f461.zip.