iOS 9.1 (build 13B5119e) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2015-09-23T17:55:09Z. The update package is 168.03 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: 73a3fda96144362948705130935609825169e39b.zip.