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 178.6 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2da28ee996508ca6349e61c0ff637da493373014.zip.