iOS 9.0.1 (build 13A404) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2015-09-23T17:55:22Z. The update package is 1.09 GB. This is a delta (partial) update that requires 8.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4f76ac9bafa3c17b68ddc1275eb08c80b5bd7c0f.zip.