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 865.43 MB. This is a delta (partial) update that requires 8.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 67c0d9a82d6aa178930d135dfa078cdf5e5bde58.zip.