Most BR21 dongles have a hidden reset button (accessible via a paperclip hole) or a pairing button. Hold it for 10 seconds while the device is plugged in.
To install the driver, the BR21 chip must be in Download Mode. jieli br21 driver free
While the BR21 is driver-free, your computer's USB host controller is not. Outdated chipset drivers (Intel, AMD, ASMedia) can cause USB audio dropouts. Most BR21 dongles have a hidden reset button
Sometimes, an application (like Zoom or Discord) takes exclusive control of the USB audio device. jieli br21 driver free
There are two common scenarios: