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Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.
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ESP32 & could not open port 'COM5': PermissionError(13, 'Access is denied.', None, 5) - espressif32 - PlatformIO Community
Micom S1 studio error during front port connection "port is busy" OR "cannot open port" | Schneider Electric Egypt and North East Africa
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