iPadOS 9.1 (build 13B137) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2015-10-12T16:56:50Z. The update package is 1.32 GB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 729dbc9a6624e1068472a367c6d3a4391ca41cf7.zip.