Right-click the device and choose Update driver . Browse Local: Choose "Browse my computer for drivers".
Go to the tab and change the Property dropdown to Hardware Ids . Copy the string (it will look like USB\VID_xxxx&PID_xxxx ). jieli br21 driver link
If using Linux, the device might need to be switched from storage mode to audio mode using usb_modeswitch . Right-click the device and choose Update driver
Note: Some of the file sizes listed appear unusually large (in the GB range). These large sizes likely result from an error in the archive's metadata or the inclusion of many other tools alongside the driver. jieli br21 driver link