Tip: If you are on Windows 10, try running the application in for Windows 7 and as an Administrator . Summary Checklist Swap the USB cable and use a USB 2.0 port . Reinstall FTDI drivers manually from the software folder. Run the Full Test script to check for hardware failure.

Check to see if the PC recognizes the hardware.

: Temporarily disable antivirus or firewalls that might be blocking the communication link. Software Version : If version V89 fails, try version