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jq-bt: loading firmware jq_bt_fw.bin failed (err -2) jq-bt: device hci0: initialization timeout The firmware file was missing. Jasmine found it on the vendor’s FTP site under /lib/firmware/ but incorrectly named jq-bt-fw.bin instead of jq_bt_fw.bin . Alex symlinked it:
dmesg showed:
git clone http://vendor.example.com/jq-bt-driver.git cd jq-bt-driver make sudo make install sudo modprobe jq-bt After loading, lsmod | grep jq showed the driver active, but Bluetooth still failed. Alex checked:
sudo ln -s /lib/firmware/jq-bt-fw.bin /lib/firmware/jq_bt_fw.bin sudo rmmod jq-bt sudo modprobe jq-bt Success! hciconfig now showed hci0: Type: Primary Bus: USB . The demo worked. Leo asked Alex to write a one-page internal guide: "jq-bt Bluetooth Driver Troubleshooting" — which became the team’s go-to reference.
usb 1-1: new full-speed USB device number 4 using dwc_otg usb 1-1: Product: JQ-BT100 bluetooth: hci0: request failed: -110 Alex recognized the pattern — the kernel didn’t have the right firmware or driver for the jq-bt series. Jasmine checked the module’s datasheet: Chip: JQ-BT v3.2 Host interface: UART / USB Driver: jq-bt.ko (custom for Linux kernel 5.10+) Firmware: jq_bt_fw.bin The driver wasn’t in the mainline kernel. The vendor provided a tarball with source code and a README:
sudo dmesg | grep jq Output:
hciconfig No Bluetooth adapter found.
We are market leaders with a focused approach on delivering quality services to our global clients. MartPro's marketplace software and platform expertise take you where you want to go. From idea to launch, profitability to growth, and beyond.