BIAS Head/Rack doesn't come with a separate USB driver and it follows the general USB protocol provided by Apple & Microsoft on your computer. Please follow the troubleshooting steps below to see if that helps:
1. Always leave your BIAS Head/Rack powered off until BIAS Amp2 Desktop is installed and set up on your computer.
2. Try using a different USB Type B cable or connect it to a different USB port.
3. Remove all existing USB devices such as audio interface or MIDI keyboard from your computer.
4. Always use "High Performance Mode" on your computer. For an in depth guide, please see these articles:
How to Setup High Performance Mode on Win10:
How to Setup High Performance Mode on Mac OSX:
5. Find the USB G1 device on and remove it from your computer.
Navigate to Device Manager->Click on Other Devices & Sound,Video and Game Controller categories. Uninstall the G1 device on and install it again.
Navigate to Audio MIDI Setup->Show MIDI Studio. Remove the G1 device and plug your BIAS Head/Rack to computer via USB again.
*If you still failed to connect BIAS Head/Rack with your computer via USB, please send us a request to create an official bug report: