: Once recognized, the blue LED on the dongle should flash quickly. Put your headphones/speakers into pairing mode nearby; the dongle usually pairs automatically without a software interface.
The JieLi BR21 driver is a standard USB-to-Serial driver used for flashing. It is free but usually found in developer SDKs rather than a standard download page. Always install it manually via Device Manager for the best results. jieli br21 driver free
lists specific driver versions for Borofone and Teclast devices using the BR21 chip. : Once recognized, the blue LED on the
: If the device has a flashing LED, it is in pairing mode. Put your headphones or speaker into pairing mode, and the BR21 should connect automatically. Troubleshooting Common Issues It is free but usually found in developer
The BR21 uses the 2.4 GHz band. If you have active Wi-Fi, a microwave, or many other Bluetooth devices nearby, you may experience disconnections. This is a hardware limitation, not a driver issue.
(typically under "Sound, video and game controllers" or "Universal Serial Bus controllers"). Right-click it and select . Unplug the device and restart your computer.
Sites like or Station-Drivers often archive Jieli BR21 drivers. Only use these if you have an antivirus running.