chip rather than a standard Bluetooth dongle that requires specific manufacturer drivers. Because it often identifies as a USB Composite Device USB Sound Card
Jieli BR21 Driver Link
The Jieli BR21 is a low-cost, all-in-one Bluetooth chip often found in: jieli br21 driver link
The device is stuck in "UBOOT" or "Mass Storage" mode instead of Bluetooth mode. chip rather than a standard Bluetooth dongle that
Because the official site is difficult for international users to access, the files are widely mirrored by the open-source and hacking community on GitHub. support is often community-driven.
The is not as simple to find as mainstream hardware drivers. Because the chip is popular in budget-friendly Chinese audio adapters, support is often community-driven.