I don't know what can be wrong, this firmware has been used for thousand of users on the same board without issues. Here are some suggestions:
If you are using a custom display, you can try remapping the serial ports: #defineSERIAL_PORT2, #defineSERIAL_PORT_2-1 . Valid addresses are -1, 0, 1 and 2.
Reinstall the USB driver (Maple) on Windows.
Make sure you don't have any other software hijacking your serial interface (like Cura, Octoprint, etc...)
Some ideas...
Hi,
I don't know what can be wrong, this firmware has been used for thousand of users on the same board without issues. Here are some suggestions:
Regards,