Problems to communicate with a CH340 uart on USB

I'm trying to communicate with a arduino-clone, that is using a ch340 uart for USB.

To manage that, I used the driver, provided by the manufacturer, available on GitHub:

https://github.com/adrianmihalko/ch340g-ch34g-ch34x-mac-os-x-driver

I used the version 1.5, after I made sure, that there is no ch340-driver on my Mac OS 10.15.7 Catalina in

/Library/Extensions/.

Following the recipe, given on GitHub, the driver occured at the correct directory. Great!

There were no security problems, because the driver is signed by the vendor.

When I plug in the device, it's not recognized. To check it, I use: ls /dev/*** or ls /dev/tty*.

When I plug in an arduino uno, it's recognized and the usb-entry occurs.

Has anyone a good idea, what to do?

Kind regards

Mike