My students are using Arduino IDE and Seeeduino Lotus Cortext M0+ (185 pcs.). Now the serial port of 14 of those boards is not found.
I can’t select the Serial Port via Tools > Ports*
How can I fix this?
These boards worked before. I found I can get boards manually into bootloader mode (doubleclick the Reset) But this does not work with the failing boards.
This is the problem (board/port not found - MAC):
It is not the Computer or USB cable, same setup with other Seeeduino works perfect - same MAC:
Thank you so mutch!
Hermanus van Vugt
(University of Amsterdam)