Arduino Uno CH340 OSX el Capitan problem

Hi, with my new computer with osx el capitan the arduino uno ch340 doesn't work. I disabled kext, installed a new driver and now in Tools/ports i find "cu.wchusbserial1430" This is with both arduino uno I have. It automatically selects Arduino/Genuino Uno

BUT: When I try to upload a sketch I always get:

avrdude: ser_open(): can't open device "unknown": No such file or directory ioctl("TIOCMGET"): Inappropriate ioctl for device Problem beim Hochladen auf das Board. Hilfestellung dazu unter http://www.arduino.cc/en/Guide/Troubleshooting#upload.

What am I doing wrong?

Thanks in advance,

cuci

Yesterday evening I connected both Arduinos to my Raspberry Pi and it seems that one of them doesn't work. But they connect via "ttyusb", so the "cu.wchusbserial1430" above looks strange to me. How does it look at other people mac computers?

How do I uninstall the driver?

When I do
kextstat | grep -v “apple”
I get
150 0 0xffffff7f83f92000 0x8000 0x8000 wch.usb.usb (1) EA641D5C-6B8B-3281-85B4-9D52DB2C11BB <126 38 4 3>

is there a way to uninstall that?
I hope that a clean install o the driver will solve my problems.