Hi @bpm009 ,
Caused by: jssc.SerialPortException: Port name - COM9; Method name - openPort(); Exception type - Port busy.
Please check below:
- Do you close all serial port application? (i.e. Serial Monitor)
- Did you enter BOOTLOADER mode? (double-tap the RESET)
If you cannot solve it, please attach VID&PID at VCOM in BOOTLOADER mode.