I got a questions about the use of avrdude,
First, it is possible to upload my .hex file on arduino without using any other device, i mean can i directly connect my arduino nano to pc by USB ?
If yes, i got no idea why my cmd line isn't working, i tried this after checking how does avrdude works in this page :
avrdude.exe (c arduino -p m328p -P COM9 _b 57600 _Uflash:w:"reset_rom.hex":i
Before using the cmd i do save my .hex file on C:\
i got this result : avrdude.exe : ser_open(): can't open device "\.\COM9" : Access denied
Thanks by advance for you answers !