I wonder if anyone can please assist with an M0 upload issue.
Upload from the Arduino IDE works fine. However putting the board in bootloader mode and uploading the same command from the windows command prompt fails every time.
Steps to reproduce....
In the arduino ide enable file>preferences>upload verbose and then upload.
After upload you will see the avrdude.exe upload command.
Highlight the avrdude command with the mouse and then use the keyboard to copy the highlighted command.
Open/run windows CMD (command prompt)
Past the command line with right click.
Press the reset button on your M0 so it goes into bootloader mode.
Press ENTER in the cmd window to run the avrdude.exe upload command
It's a confusing one. Avrdude.exe runs and establishes the device id but then hits a lot of timeouts.