iOS 9.1 (build 13B5130b) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2015-09-30T17:58:11Z. The update package is 1.33 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: 9414fd4b5d5f08a1a58b7dd91d43692328cdf1ab.zip.