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 236.34 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: e3a8f7e76788dbe0b22795b12aefc00f9f09d5dd.zip.