iPadOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2015-10-21T17:15:56Z. The update package is 252.81 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 537539d31fc455641aaa50cfb558dcbb4f0135f5.zip.