Jieli Br21 Driver — Authentic & Pro

: It may appear in your device manager as a "Jieli Technology USB Composite Device" or "Borofone BR21 Stereo" . How to Install and Fix

A frequent complaint is that while the device outputs audio perfectly, the "Line In" or microphone input often fails to register levels in software like FL Studio, despite being "recognized" by the system. Generic Driver Identity: Jieli Br21 Driver

is designed to be , it uses standard Microsoft Windows USB Audio drivers. JieLi-AC690X-Familiarization/README.md at master - GitHub : It may appear in your device manager

I can confirm this works with Ubuntu 22.04. Using at terminal lsusb lists as: "ID 4c4a:4155 Jieli Technology USB Composite Device" Ask Ubuntu JieLi-AC690X-Familiarization/README

: Developers often use the "AC69 SDK" or "bt_config_tools" to program and interface with these chips.

Corrupted existing Bluetooth stack. The Fix: You may need to completely reinstall your PC's main Bluetooth adapter driver (Intel, Realtek, etc.) before the Jieli BR21 peripheral driver can successfully attach to it.