: The hardware often supports three distinct modes:

To configure the DAC driver manually at the register level, developers must initialize three distinct stages:

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: Go to your Windows Sound Control Panel, navigate to the Recording tab, ensure the Jieli Hands-Free AG Audio is set as the Default Communication Device , and check that the privacy settings ( Settings > Privacy > Microphone ) allow apps to access your microphone. Conclusion

This usually indicates a communication failure caused by a faulty USB cable or a conflicting generic driver.

If your device is not appearing as a Bluetooth option, remember it is designed to act as a , treating your computer as the source and providing Bluetooth wireless output directly to headphones or speakers.

Locate your generic device, right-click it, and select .

The (often recognized by Windows as BR21 UBOOT1.00 ) is typically a Bluetooth-enabled chipset found in USB dongles or integrated into low-cost laptops and peripherals. Rather than a standard "plug-and-play" Bluetooth stick, it often functions as a USB sound card with built-in Bluetooth receiving capabilities . Driver Identification & Download

Is the device showing up as a or a sound device in the Device Manager?

Based on the AC6921A datasheet , which shares the BR21 architecture: JieLi BR21 driver - DriverDouble.com

许多用户最初遇到的"识别为U盘"问题，源于其独特的驱动设计：杰理倾向于使用USB大容量存储协议（USB Mass Storage）来承载其专属的命令，而不是通过另一个独立的USB接口来实现。因此，这个"U盘"并非真正的存储设备，而是一个等待加载特定固件和驱动的特殊接口。

The Ultimate Guide to the Jieli BR21 Driver Exclusive: Architecture, Audio Programming, and Development Tools

You won't see a Bluetooth icon in your taskbar. Instead, the chip pairs directly with your headphones or speakers on its own hardware layer.

Compatible with Windows 7, 8, 10, and 11, as well as Linux (Ubuntu 22.04+). Exclusive Driver Features The "exclusive" nature of the JieLi BR21

One of the primary challenges in high-bitrate wireless audio is power consumption. The Jieli BR21 addresses this through an adaptive power-scaling algorithm embedded in the exclusive driver. The driver monitors signal strength (RSSI) and packet loss in real-time, adjusting the transmission power of the SoC dynamically. This ensures that the device maintains a stable link in "noisy" RF environments—such as offices with multiple Wi-Fi routers—without draining the battery of the peripheral device. Additionally, the driver supports "Multi-point Exclusive Mode," allowing the chipset to maintain high-priority data streams from two sources simultaneously without the typical stuttering found in budget Bluetooth solutions. Conclusion and Industry Impact

Some exclusive driver packages bundle a dedicated software utility. This allows users to toggle 3D surround sound, tweak microphone gain, and adjust bass boost directly at the hardware level. How to Find and Install the Jieli BR21 Driver

No. There is no separate driver for exclusive mode. Instead: