iOS 9.0.1 (build 13A405) is an official Apple over-the-air update for the iPhone 6s, released on 2015-09-24T17:59:21Z. The update package is 43.58 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: ca3ee8b4cb0a2b37b2282b905b4decaffe4302e6.zip.