![avrdude: ser_open(): can't open device "\\.\COM7": Access denied. - Installation & Troubleshooting - Arduino Forum avrdude: ser_open(): can't open device "\\.\COM7": Access denied. - Installation & Troubleshooting - Arduino Forum](https://europe1.discourse-cdn.com/arduino/optimized/4X/e/8/0/e807ffa7e6105054c5150025a15a01ee1bee10bd_2_690x387.png)
avrdude: ser_open(): can't open device "\\.\COM7": Access denied. - Installation & Troubleshooting - Arduino Forum
![avrdude: ser_open(): can't open device "\\.\COM5": access denied. - Installation & Troubleshooting - Arduino Forum avrdude: ser_open(): can't open device "\\.\COM5": access denied. - Installation & Troubleshooting - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/6/3/a/63a61243382b3de443cf81791219bf121cbc54cb.png)
avrdude: ser_open(): can't open device "\\.\COM5": access denied. - Installation & Troubleshooting - Arduino Forum
Upload fails if port is open in Serial Monitor of another window · Issue #586 · arduino/arduino-ide · GitHub
![Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it. Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.](https://gyorgybalassy.files.wordpress.com/2020/10/arduino-port-settings.png)
Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.
![Issue with USB com port on Acer Windows 10 - Port Busy or Access Denied - Installation & Troubleshooting - Arduino Forum Issue with USB com port on Acer Windows 10 - Port Busy or Access Denied - Installation & Troubleshooting - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/3/1/f/31f888c9e16cc848d2ff658e8c8938a8b417699b.png)
Issue with USB com port on Acer Windows 10 - Port Busy or Access Denied - Installation & Troubleshooting - Arduino Forum
![mac os - Why a Arduino UNO R3 board can use in Windows 10 but can't be used in My Macbook Air(M1)? - Arduino Stack Exchange mac os - Why a Arduino UNO R3 board can use in Windows 10 but can't be used in My Macbook Air(M1)? - Arduino Stack Exchange](https://i.stack.imgur.com/DRVGx.png)
mac os - Why a Arduino UNO R3 board can use in Windows 10 but can't be used in My Macbook Air(M1)? - Arduino Stack Exchange
![avrdude: ser_open(): can't open device" error, FTD1232 chip - Installation & Troubleshooting - Arduino Forum avrdude: ser_open(): can't open device" error, FTD1232 chip - Installation & Troubleshooting - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/c/4/8/c48b5eae403309dfab2d4c6a3ef29e377c555313.png)
avrdude: ser_open(): can't open device" error, FTD1232 chip - Installation & Troubleshooting - Arduino Forum
![Hey my arduino uno keeps saying ser_open(): can't open device "\\.\COM5": access denied. Any idea why am I doing somthing wrong : r/arduino Hey my arduino uno keeps saying ser_open(): can't open device "\\.\COM5": access denied. Any idea why am I doing somthing wrong : r/arduino](https://i.redd.it/hey-my-arduino-uno-keeps-saying-ser-open-cant-open-device-v0-tuvu9i31ndfa1.jpg?width=4000&format=pjpg&auto=webp&s=d8ada0b9bfcff40724d2bf66d9662074f706cfe1)
Hey my arduino uno keeps saying ser_open(): can't open device "\\.\COM5": access denied. Any idea why am I doing somthing wrong : r/arduino
![Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it. Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.](https://gyorgybalassy.files.wordpress.com/2020/10/arduino-serial-port-in-device-manager.png)
Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.
![Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it. Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.](https://gyorgybalassy.files.wordpress.com/2020/10/arduino-port-selection.png)
Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.
![Issue with USB com port on Acer Windows 10 - Port Busy or Access Denied - Installation & Troubleshooting - Arduino Forum Issue with USB com port on Acer Windows 10 - Port Busy or Access Denied - Installation & Troubleshooting - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/a/5/f/a5fe0cf1b6d39cbae3a9eb8d56d13d2281ddfddc.png)