Arduino 2: COM port disappears after firmware upload on native port

Hello everyone!

This is my firt post and I thank you in advance. Maybe someone already faced this issue but I was not able to find a solution on the forum. I uploaded a .bin file on my Arduino 2 using the native port and bossac using the command line. The command i launched is:

bossac.exe --port=COM12 -U true -e -w -v -b PWM_PWM_LED_EXAMPLE1.bin -R

Upload went ok but after that the COM port disappears. COM port does not appear if i plug/unplug the USB cable.

Someone could explain me why? Possible solutions?

Many thanks! 8)

Maybe with your upload method you over-wrote the bootloader.
Try burning it again.

Thank you for your reply! I don't think so because as I manually erase and reset the Arduino Due, the COM port Bossa appears and I can upload a new .hex.
I red that after an uploading a new COM with new name "Arduino Due Programming Port" should appear.