Typically driverless; purely analog or Bluetooth-based (e.g., aptX HD, LDAC support). Configuration Tips
Windows changed the default audio device to a different output (e.g., HDMI or Realtek). Fix: Right-click the speaker icon → Open Sound settings → Output → Select Fosi Audio Device . Also, check that sample rates match between Windows and the Fosi Control Panel. fosi audio drivers full
You're looking for information on Fosi Audio drivers, specifically the full version. Here's what I found: Typically driverless; purely analog or Bluetooth-based (e