iPadOS 9.1 (build 13B5130b) is an official Apple over-the-air update for the iPad 4 (GSM), released on 2015-09-30T17:58:06Z. The update package is 1.21 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 041964cc18ec8d5a240e40ef34db68b9400d0c35.zip.