| 3 Pre-Installation Tasks |
: While it mainly functions for audio, some versions can appear as a storage device or CD-ROM drive initially to allow for firmware updates or driver installation via manufacturer-specific tools.
: In most modern operating systems like Windows 10 and 11, these devices are "Plug and Play," meaning they use generic Windows drivers. jieli br21 driver
Ensure the device is set to "Stereo" (A2DP) rather than "Hands-free AG Audio" in Sound Settings. For Developers: Programming the Chip : While it mainly functions for audio, some
For end users, the BR21 does not require installing any software on a phone or computer to function as a Bluetooth audio receiver. The chip implements standard Bluetooth profiles (A2DP for audio, HFP for hands-free calls, AVRCP for control). However, when a manufacturer or hobbyist wants to update the firmware or configure the chip (e.g., change button mappings, EQ settings, or device name), they connect the BR21 module to a PC via USB. At that point, the computer needs a (often CH340 or CP210x, depending on the board design) and the proprietary Jieli PC tool (e.g., “Jieli MP Tool” or “BR21 Config Tool”). For Developers: Programming the Chip For end users,