![SOLVED] INAV Failed to open serial port on WINDOWS · Issue #726 · iNavFlight/inav-configurator · GitHub SOLVED] INAV Failed to open serial port on WINDOWS · Issue #726 · iNavFlight/inav-configurator · GitHub](https://user-images.githubusercontent.com/45081450/87424772-d37ec900-c5dc-11ea-8f40-4dd6163a067d.png)
SOLVED] INAV Failed to open serial port on WINDOWS · Issue #726 · iNavFlight/inav-configurator · GitHub
Technology Dwell: When try to connect to Internet USB Modem (Huawei/ZTE/LG/Nokia), it gives error: “Unable to open serial port” or “ Unable to open COM port for USB Modem”
![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.
![PuTTY can access serial port as /dev/ttyUSB0, but not as named udev device - Unix & Linux Stack Exchange PuTTY can access serial port as /dev/ttyUSB0, but not as named udev device - Unix & Linux Stack Exchange](https://i.stack.imgur.com/vYXzk.png)