(I'm the same as Guest_vtjnash from the old system) Update for 10.10 Yosemite: Apple now includes the FTDI driver with the OS, so downloading the driver separately is not required. However, the file to update is slightly different because of this. In /System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/AppleUSBFTDI.kext/Contents/Info.plist comment out or remove the section "<key>AppleUSBEFTDI-6010-0</key><dict>...</dict>" Then run: sudo touch /System/Library/Extensionsso the system will rebuild the kernel cache (to pick up the changes on the next reboot), and run kextunload /System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/AppleUSBFTDI.kextkextload /System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/AppleUSBFTDI.kextto pick up the changes immediately.