my arduino uno r3 gives me that error:
avrdude: ser_open(): can't open device "\.\COM4": Das System kann die angegebene Datei nicht finden.
I uploaded my code yesterday and it still works but i can't upload a new code. The board still gets power by the USB connection and the led on lights.
I tried the reset button but still doesn't help.
Anything i can try?
Thanks in advance.