Well in the future you should save your important files in more than 1 place. Even on a spare usb thumbstick or sd card. I enjoy setting up Marlin and you should, too. I say this because there are always new versions of Marlin coming out and if you are comfortable with setting it up then you will likely always run the latest version instead of whatever you were able to get going that one time. Currently Marlin is up to 2.0.7.2 But before you change the mainboard why not use the other extruder stepper socket?