I downloaded the “Jieli BR21 driver full” package because my generic Bluetooth earphones (BR21 chip) kept disconnecting on Windows 10. After installing the driver and rebooting, the connection became stable and audio latency improved slightly.
Select or USB Composite Device from the list and complete the prompt. jieli br21 driver full
When plugged into a machine running Windows, macOS, or Linux, the operating system bypasses standard Bluetooth stack enumeration. It recognizes the hardware directly as a generic USB composite sound card/audio device named "JieLi BR21" . I downloaded the “Jieli BR21 driver full” package
Right-click and select . Manufacturer Specific Drivers: and Performance Optimization
The Ultimate Guide to the Jieli BR21 Driver: Installation, Troubleshooting, and Performance Optimization