Cannot Open Focusrite Usb | Asio Error Code 0x54f

Set your (like Realtek) as the Default Playback Device . This prevents Windows from "locking" the Focusrite driver before your DAW can access it. Advanced Solutions

pnputil /enum-devices /class Audio

If the error persists, a "clean" reinstall is often necessary to remove corrupt registry entries. Error Code 0x54f - Cubase - Steinberg Forums cannot open focusrite usb asio error code 0x54f