In some cases, if the drivers are updated or reinstalled through a windows update, Windows may install its own driver for the APU.  This may also occur if you connect an APU before installing the Mimosa driver.  

How to determine if this is the issue:

  1. Open Device Manager – Open the “Run” dialog by pressing and holding the Windows key, then press the R key (“Run”).  Type devmgmt.msc.  Click OK.
  2. In the device manager, click on the “>” next to Network Adapters.   This will bring up a list of all the network adapters.  Also click on the “>” next to Ports (COM & LPT).  This will bring up a list of all the serial and parallel ports.  The Ports list may not show up if you do not have any active ports.
  3. Plug in the APU.  
  4. Watch the Ports list.  If a new Port labeled “COM x” (where x is a number between 1-20) shows up, (or if there were no Ports, and the header suddenly appears), then Windows has installed a COM port driver that is taking precedence over the Mimosa APU driver.
  5. If instead of a new COM port appearing, the Mimosa Acoustics RNDIS driver appears in the Network Adapters list, then this issue does not apply to your computer.

How to correct this:

  1. With the APU still connected, right-click on the new COM Port, and select “Uninstall this device”.  A confirmation box will appear.  Click OK.
  2. Unplug the APU.
  3. Install the Mimosa Acoustics driver by running the HearID driver executable file appropriate for your version of Windows  (x32 or x64). You can do this step by simply running the HearID installer and choosing to install with drivers.
  4. After the driver installation program completes, plug in the APU while watching the Network Adapters list in the Device Manager (as in steps 4-5 above).   The Mimosa Acoustics RNDIS driver should appear in the Network Adapters list.