Jieli Br21 Driver ((new)) -

: Users have reported that JieLi-based Bluetooth receivers often drop connections every 5–10 minutes, especially in environments with high interference. Incomplete Configuration

What is it? (headphones, speaker, USB dongle?)

This is where the main confusion lies:

: If the device has a physical button, holding it while plugging it in may switch it from "Storage" mode to "Bluetooth/Audio" mode.

: Many generic 4-to-8 channel mixers use this chip to handle the USB interface for recording or playback. Jieli Br21 Driver

driver. If it's failing, try right-clicking the device, selecting Update Driver , and then choosing "Search automatically for drivers." Check for "UDISK" Mode

The Jieli BR21 chip is a highly integrated, low-cost Bluetooth microcontroller developed by Zhuhai Jieli Technology. It is widely used in budget-friendly wireless consumer electronics, including Bluetooth receivers, car audio adapters, wireless headsets, and USB dongles. : Users have reported that JieLi-based Bluetooth receivers

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 USB Dongle 4.0 Update Tool Manual

Understanding the Jieli BR21 Driver: Functionality, Installation, and Troubleshooting : Many generic 4-to-8 channel mixers use this

: When plugged in, a blue LED usually flashes rapidly on the dongle or speaker. Connecting Turn on Bluetooth on your smartphone or PC. Search for new devices. "JieLi Br21" from the list. : The BR21 is often a receiver-only

2. Device Shows as "Unknown USB Device (Device Descriptor Request Failed)"