Users typically search for this term for two reasons:
If you are reading this, you have likely purchased a Bluetooth adapter, dongle, or a DIY audio module based on the chipset. Jieli (Zhuhai Jieli Technology) is a leading manufacturer of Bluetooth SoCs (System on Chips), powering millions of USB dongles, wireless headsets, and home theater receivers.
If your device is not working correctly, it is rarely due to a missing specialized "BR21" driver and more likely a configuration or system driver error. 1. Use Windows Built-in Update
: 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.