Everything was running at one time, but felt the need to recalibrate- then left motor went erratic so decided to reload everything, and reset cables. Having issues getting firmware back on- deleted everything and trying to follow instructions to start over… Once software is loaded, correct board and serial port #5 are preselected (as before when it worked)
Step 2: Download The Arduino IDE
Download and install the last Arduino IDE from https://www.arduino.cc/en/Main/Software. Older versions of Arduino IDE have problems with libraries when compiling the firmware, so make sure you have the latest version.
(using windows app- also tried stand alone option for windows- same error)
Step 3: Download The Latest Maslow Firmware
You can do this at http://github.com/MaslowCNC/Firmware/releases/ Click the zip file for the most recent release to download
Using source code zip file