Known Issues

USB Connection Issues on Mac

Yosemite 10.9 (and OS X 10.10 and newer) requires a signed USB driver kext (kernel extension). You can find one on the FTDI web site here: http://www.ftdichip.com/Drivers/VCP.htm

Use version 2.3 for 64-bit OS X 10.9 or later. Install and reboot.

Open a Terminal command: sudo nvram boot-args="kext-dev-mode=1"

Reboot.