iOS 9.0.1 (build 13A404) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2015-09-23T17:55:23Z. The update package is 1011.82 MB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 94c92e61f3cb8a664ec56be6683038e6b0e33443.zip.