Standard $10 Bluetooth dongles lack the specific handshake protocol required by the DacMagic.
Since the BT100 port is a dead end, follow these steps for the best audio quality: cambridge audio bt100 alternative patched
If you own a classic Cambridge Audio DacMagic Plus or Stream Magic 6, you know the frustration of the BT100. It is often overpriced, outdated, and restricted by a proprietary form factor. While a "patch" in the software sense doesn't exist to make any random USB dongle work, there are superior hardware alternatives that bypass the need for the BT100 entirely. Standard $10 Bluetooth dongles lack the specific handshake
The Hardware Reality: Why You Can’t Just "Patch" a USB Dongle While a "patch" in the software sense doesn't
Use the high-quality digital inputs (Optical or Coaxial) on your device to connect a dedicated Bluetooth receiver. Best Overall Alternative: The External Bluetooth Bridge
Supports aptX HD and LDAC, which the BT100 lacks. Superior Range: Features an external high-gain antenna.
A comparison of if you want to skip Bluetooth for even better sound. Which direction