Once the device is recognized, look for a flashing blue LED. This indicates it is in pairing mode . It may take a minute for the OS to finalize the setup before this starts.
This is where the becomes essential. Unlike standard CSR or Broadcom chips that use native Microsoft drivers, the Jieli BR21 often requires a specific USB driver to function as a standard Bluetooth radio. jieli br21 driver link
Since Jieli is a chip manufacturer (OEM) rather than a consumer brand, they don't host a "Download" button for end-users on their official site. Instead, use these reliable alternatives: Jieli BR21 Bluetooth dongle shown as storage device Once the device is recognized, look for a flashing blue LED