When trying to upload firmware I get the following errors:
timeout - cannot sync, or
port is in use
What can be the possible sources of these errors?
There are mainly three reasons for that:
- Arduino studio settings should be:
- Board: Mega 2560 and
- Programmer: AVR ISP
- and valid COM port, please see below:
Please close all slicer's instances (Cura, Slic3r, Repetiter) and host servers and other software that communicate with the printer as they lock the COM port;
Please check that the appropriate usb2serial drivers are installed and working - the best way is to start the serial monitor from the Arduino Studio Tools menu and see if there are any.