It seems when ever I start a new project I have a problem with the COM port. I get the following message "avrdude: ser_open(): can't open device "\.\COM4": The system cannot find the file specified." I have tried to go into Windows 8.1 and change the COM port of the Arduino Uno to COM4 but is says…

Can't open device COM4

JerryPugh October 8, 2021, 5:57pm 7

JohnRob I appreciate your suggestion but, I am not familiar enough with computer stuff to follow your directions. I downloaded the latest UBS drivers from "Driver support One" But I got the same result. Sorry for being so dense.

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An error occurred while uploading the sketch avrdude: ser_open(): can't open device "\\.\COM4": The system cannot find the file specified Uploading	5	7381	December 29, 2022
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Can't open device COM4

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