: Look for "Bluetooth Radios" or an "Unknown Device" under Other Devices .
Before installing a driver, you must identify the manufacturer of the Bluetooth radio chip, as the "MBT-503-03" model name is often just for the external casing. Bluetooth mbt-503-03 driver windows 7
If you don't have the original disk, search for these specific terms to find the installer: CSR Harmony Wireless Software Stack 2.1.63.0 download : Look for "Bluetooth Radios" or an "Unknown
