Following the release of iOS 13.1 beta 3, the Cupertinos rolled out a pre-release version of iOS 13.
Most likely, there will be no changes with the final release. Or they will be minimal. So you can safely install this beta version, it is the last.
Update size – about 500 MB. Download iOS 13 GM can now authorized developers. The official release date is September 19.
If you have iOS 13.1 installed, then downloading iOS 13 GM “over the air” will fail. Need a separate firmware file