iPadOS 9.1 (build 13B137) is an official Apple over-the-air update for the iPad 2 (WiFi), released on 2015-10-12T16:56:45Z. The update package is 965.73 MB. 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: 2bf7ff57e72120b6cb2a16f1320327b25131a4c0.zip.