The problem is that I cannot upload sketches to my Arduino Due while it is visible both in Windows device manager (as Arduino Due programming port) and IDE (Tools -> Port). After memory erase native USB port appears in Windows as "Unknown device" instead of common "Bossa port"
I followed loop-back instructions (the pinned topic) and everything I send using serial monitor to Arduino is echoed back immediately.
If you have a clue what happened and how to fix it, please, tell me.
Thanks in advance
PS If your answer includes uploading new bootloader or smth using programmer, I have only serial one
and have no idea on how to use it with due