iOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2015-10-21T17:16:00Z. The update package is 178.56 MB. This is a delta (partial) update that requires 9.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f2599942f699cd5f6e9ac6730a9a237539b88a06.zip.