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When diagnosing a driver issue, the operating system relies on string identifiers called Hardware IDs. If your device is throwing errors or acting like an unrecognized "Unknown Device," it will usually display one of the following strings in its property settings:
Here is a summary of driver versions reported by online sources for informational purposes:
. It uses standard class-compliant USB audio drivers, meaning you rarely need to download a specific manufacturer file. Dual Functionality Jieli Br21 Driver
If there are no driver files, only large, unplayable MP3 files, you may have purchased a variant designed for a different purpose, likely a car audio receiver.
Often acts as a Bluetooth receiver, decoding audio and outputting it via USB audio class or standard audio output.
In many cases, the BR21 isn't meant to add Bluetooth capabilities to your PC (like a mouse/keyboard dongle). Instead, it acts as a bridge to send PC audio to Bluetooth headphones or receive audio from a phone. This public link is valid for 7 days
is designed to be , it uses standard Microsoft Windows USB Audio drivers. JieLi-AC690X-Familiarization/README.md at master - GitHub
If you want, I can:
Test the USB dongle on another computer to ensure the physical chip is not defective. Can’t copy the link right now
When the AC690X device is connected, it appears as a "BR21 or BR17 device" in the "Disk drive" section of Windows Device Manager. For the BR21, you would then edit the download.bat script to replace references to br17 with br21 and rename the loader file accordingly before running the script. For more advanced users, similar device communication can also be achieved using the pyusb library in Python, which allows for low-level USB control and firmware updates on Linux systems.
On Linux environments, the Jieli BR21 hardware ID typically prints out as ID 4c4a:4155 Jieli Technology USB Composite Device . The kernel handles this natively via ALSA modules, though initialization delays are common.
DP and DM data pins default to high impedance.