While there is no official or widely recognized "patched" firmware to make generic USB dongles work with the Cambridge Audio BT100 port, you can easily bypass the proprietary requirement using high-quality hardware alternatives. The Compatibility Barrier
Better DAC: While it has its own DAC, you can run its Optical/Coaxial out into your DacMagic. cambridge audio bt100 alternative patched
Cambridge Audio BT100 Overview
Are you looking to keep the setup as compact as possible, or is audio quality the main priority for your system? While there is no official or widely recognized