Please make sure board switch is on (on is heat sink side).
Please make sure FaboollaserWin or FaboollaserMac is deleted.
Windows: Please make sure there is no faboollaserwin in the program and function of control panel. In case it exist, please do ride side clicking on faboollaserwin, and run the uninstall.
Mac: Please make sure there is no faboollasermac in MacintoshHD library and no com.smartdiys.faboollaser.plist in LaunchDeamons. If those exist, please delete it.
Please change the USN port you are using.
Please unconnect another USB cables in case you have others except FABOOL machine's.
Please connect USB directly to PC ( Don't use hub tools)
For Windows user
Please check if it shows "STMicroelectronics Virtual COM Port（COMｘ）" at "Port (COM and LPT)" of device manager after you connect machine and PC with USB.
→If it doesn't show, please make sure board switch is on ( heat sink side ). If the switch is on, it is driver install error, so please install desktop software.
*At that time, please check serial communication driver on component choice.
*If it still says not connected after you try all of the above, please install browser software's driver, and uninstall it right after.