![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.
![Arduino error (Ubuntu) - avrdude: ser_open(): can't open device "COM1": No such file or directory - YouTube Arduino error (Ubuntu) - avrdude: ser_open(): can't open device "COM1": No such file or directory - YouTube](https://i.ytimg.com/vi/oQLzCdDhkgo/hqdefault.jpg)
Arduino error (Ubuntu) - avrdude: ser_open(): can't open device "COM1": No such file or directory - YouTube
![Arduino Nano - "avrdude: ser_open():system can't open device "\\.\COM1": the system cannot find the file specified" - Stack Overflow Arduino Nano - "avrdude: ser_open():system can't open device "\\.\COM1": the system cannot find the file specified" - Stack Overflow](https://i.stack.imgur.com/1kNPb.png)
Arduino Nano - "avrdude: ser_open():system can't open device "\\.\COM1": the system cannot find the file specified" - Stack Overflow
Arduino IDE 1.6.8 - Can't open device error while uploading (No issue in 1.6.7) · Issue #4700 · arduino/Arduino · 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-properties.png)
Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.
![Arduino Nano - "avrdude: ser_open():system can't open device "\\.\COM1": the system cannot find the file specified" - Stack Overflow Arduino Nano - "avrdude: ser_open():system can't open device "\\.\COM1": the system cannot find the file specified" - Stack Overflow](https://i.stack.imgur.com/cx8c7.png)
Arduino Nano - "avrdude: ser_open():system can't open device "\\.\COM1": the system cannot find the file specified" - Stack Overflow
![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.
![Ubuntu Arduino Snap ( can't open device "/dev/ttyACM0": Permission denied) - Installation & Troubleshooting - Arduino Forum Ubuntu Arduino Snap ( can't open device "/dev/ttyACM0": Permission denied) - Installation & Troubleshooting - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/2/5/2/252b2a131a7852d5458f7402fc8e1d75fb4a9db4.png)
Ubuntu Arduino Snap ( can't open device "/dev/ttyACM0": Permission denied) - 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
![Arduino Nano - "avrdude: ser_open():system can't open device "\\.\COM1": the system cannot find the file specified" - Stack Overflow Arduino Nano - "avrdude: ser_open():system can't open device "\\.\COM1": the system cannot find the file specified" - Stack Overflow](https://i.stack.imgur.com/PCjNG.png)
Arduino Nano - "avrdude: ser_open():system can't open device "\\.\COM1": the system cannot find the file specified" - Stack Overflow
![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
![Arduino UNO not working; Arduino: avrdude: ser_open(): can't open device "\\.\COM4": The system cannot find the file specified. . I haI have also changed the COM Port in windows like the YT Arduino UNO not working; Arduino: avrdude: ser_open(): can't open device "\\.\COM4": The system cannot find the file specified. . I haI have also changed the COM Port in windows like the YT](https://preview.redd.it/arduino-uno-not-working-arduino-avrdude-ser-open-cant-open-v0-lpr1a6rub2j91.png?width=490&format=png&auto=webp&s=2e2c2049364bae950197b9c4a210cb091fd786dd)
Arduino UNO not working; Arduino: avrdude: ser_open(): can't open device "\\.\COM4": The system cannot find the file specified. . I haI have also changed the COM Port in windows like the YT
![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-saz698g0ndfa1.jpg?width=4000&format=pjpg&auto=webp&s=f86544c832b142ce0a75628c7cf06cef7d5e7f5b)
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 "\\.\COM5": The system cannot find the file specified problem - Interfacing w/ Software on the Computer - Arduino Forum can't open device "\\.\COM5": The system cannot find the file specified problem - Interfacing w/ Software on the Computer - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/f/6/6/f66917abaa24bcdaa1ca6c28640948da7924af0d.png)
can't open device "\\.\COM5": The system cannot find the file specified problem - Interfacing w/ Software on the Computer - Arduino Forum
![avrdude: ser_open(): can't open device "\\.\COM9": Access is denied. - Avrdude, stk500, Bootloader issues - Arduino Forum avrdude: ser_open(): can't open device "\\.\COM9": Access is denied. - Avrdude, stk500, Bootloader issues - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/5/a/5/5a599607ba17e0f6fab970b65a3992b63195fda7.png)