This has nothing to do with the software or the driver. This simply shows that the Mac is recognizing that a USB controller with the Silicon Labs chipset is connected. Are you plugging the USB cable directly into the Mac or into a Hub? Make sure it is directly into the Mac, at least for this troubleshooting. Also, make sure you're disconnecting the correct USB cable during the install. It is often the little things. Go to the Security & Privacy pane and let me know what your setting is for gatekeeper. Make sure you don't have the "App Store Only" option selected. I don't think you do, but double check. The terminal program is in the Applications folder under the Utilities folder. To do the uninstall (if I remember correctly: I'm at work on my "lunch" break and not in front of my Mac), do the following. Physically disconnect the USB cable from the Mac Unzip the driver download, open the DMG file, and drag the uninstall.sh program to your desktop. Open the terminal program Type the following (do not hit enter and do not put a space after the slash) sudo ./ Now drag the uninstall.sh file to the terminal window which should fill in the info so that it looks something like: sudo ./Users/username/Desktop/uninstall.sh Hit enter, and it should ask you for your password. Go ahead and type it in and hit enter again. The script should execute and remove your driver. Now, reboot the computer. Once you're logged back in, open the driver download and the DMG file and run the installer.pkg file (whatever it is called). Once done, reboot yet again. When the Mac starts up, double check the Security & Privacy pane in System Preferences to make sure there is no warning regarding Kernel Extensions. If there are, approve the install and then to be safe, reboot again. Once you're logged back in, only then connect the rig to the Mac. Double-check yet again the Security & Privacy pane in the System Preferences, then go to the Terminal program and do the following (hit enter after each line) cd /dev ls cu.* cut and paste the results here.