iOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2015-10-21T17:16:04Z. The update package is 219.46 MB. This is a delta (partial) update that requires 9.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bce886a5331c9b3ed02d4c83e54e1bd15d326e0d.zip.