avrdude: ser_open(): can't open device "\\.\COM4": acces denied

Hello everyone (I say it right now, I'm french, sorry for my mistakes)

I just don't know what to do, I have 2 Arduino Uno (clone) which were working fine untill today. More precisly, these are still working fine, but I cannot televerse any program on it (both) The COM port is the good one, I selected the right Arduino on the IDE, I've downloaded the latest version of the IDE, including the driver, and even installed an other driver (CH340)...

But still the same error message... Huge thanks for any help...

This error is usually caused by some other application having the COM port open. It can only be open in one application at a time. Make sure to close any other applications that are using that port.

If you don't find any other application using the port, try restarting your computer. Sometimes things glitch out and the port gets stuck open.

I did it and it works again :) I think it could be Ulitmaker Cura which was using the COM Port, when we save a .gcode on the SD Card... (I'll try just to close it the next time, before restarting my computer...) Thanks for your help ;)

You're welcome. I'm glad to hear it's working now. Enjoy! Per