Hello, I have been trying to upload a very simple script to my Arduiono Mega 2560 but I have been getting this error: [Enter error] I tried using my fake Uno (yourDuino - got it in some set) and I got this error on Com10: avrdude: ser_open(): can't open device "\.\COM10": The system cannot find th…

I will see what I can do, Thank you for your help :smiley: Edit: I THINK I FIXED IT! Unplug Arduino. Run the code without the Arduino plugged in multiple times Plug Arduino back in Run code! Another Edit: I have to redo the above steps every time I want to run the code. The blink code doesn't wo…

Avrdude: ser_open(): can't open device "\\.\COM3": Access is denied

Development Tools IDE 1.x

J-M-L January 13, 2022, 1:21pm 2

some people had the same issue ten+ years ago... have you explored answers

here is one: avrdude: ser_open(): can't open device "\\.\COM3": Access is denied. - #7 by nivesh

Topic		Replies	Views
Avrdude: ser_open(): can't open device "\\.\COM3": Access is denied IDE 1.x	2	506	March 27, 2025
avrdude: ser_open(): can't open device "\\.\COM3": Access is denied. IDE 1.x	41	516489	May 5, 2021
avrdude: ser_open(): can't open device "\\.\COM3": Access is denied. IDE 1.x	2	2226	May 5, 2021
avrdude: ser_open(): can't open device "\\.\COM1": access denied IDE 1.x	6	13787	May 5, 2021
avrdude: ser_open(): can't open device "\\.\COM3": The system cannot find the fi IDE 1.x	2	2164	May 5, 2021

Avrdude: ser_open(): can't open device "\\.\COM3": Access is denied

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