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When trying to upload firmware I get the following errors:

  1. timeout - cannot sync, or
  2. port is in use

What can be the possible sources of these errors?

1 Answer 1

There are mainly three reasons for that:

  1. Arduino studio settings should be:
    • Board: Mega 2560 and
    • Programmer: AVR ISP
    • and valid COM port, please see below:

Arduino settings

  1. 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;

  2. 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.