iOS 13.0 (build 17A5534f) is an official Apple over-the-air update for the iPhone 6s, released on 2019-07-17T17:35:19Z. The update package is 489.4 MB. This is a delta (partial) update that requires 13.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f81529d9fb34eedd95a3c093b2c32fb3f431a2f9.zip.