iOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2015-10-21T17:16:03Z. The update package is 1.09 GB. This is a delta (partial) update that requires 8.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2deca0bdc735eef81136a52d0a2e64324ad91338.zip.