How can I unbind an USB interface?

Found multiple pages like this one: Manual driver binding and unbinding or this one: How to unbind/bind a usb device as normal user?

Which suggest to use the following command:

sudo echo -n "1-1:1.0" > /sys/bus/usb/drivers/usb/unbind

This gives me the following response:

echo: write error: No such device

But the folder is available inside my file system: folder found in file system

lsusb gives me:

Bus 001 Device 047: ID 0483:1234 STMicroelectronics USB2CAN converter

and usb-devices:

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 47 Spd=12  MxCh= 0
D:  Ver= 2.00 Cls=ff(vend.) Sub=ff Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=0483 ProdID=1234 Rev=01.00
S:  Manufacturer=8Devices
S:  Product=USB2CAN converter
S:  SerialNumber=5D2C531E
C:  #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
I:  If#=0x0 Alt= 0 #EPs= 4 Cls=ff(vend.) Sub=ff Prot=ff Driver=usb_8dev

Also if I try to use ’sudo echo -n "0-1:1.0" > /sys/bus/usb/drivers/usb/unbind’ or ’sudo echo -n "1-0:1.0" > /sys/bus/usb/drivers/usb/unbind’ it gives me:

echo: write error: No such device

What works is:

sudo echo -n "1-1" > /sys/bus/usb/drivers/usb/unbind

But if I try to connect like this via Chrome:

navigator.usb.requestDevice({ filters: [{}] })
.then(selectedDevice => {
   device = selectedDevice;
   return device.open()
    .then(() => device.reset())
    .then(() => device.selectConfiguration(1))
    .then(() => device.claimInterface(device.configuration.interfaces[0].interfaceNumber))

it still gives me:

DOMException: Unable to claim interface.

Also unlike this person How to claim interface using WebUSB? I can select the device.


I would like to connect to an USB device with the WebUSB API but it's giving me

DOMException: Unable to claim interface.

1 Answer 1


So basically you have to do this for "8devices".

/sys/bus/usb/drivers/usb_8dev$ echo "1-1:1.0" > unbind

in long:

cd /sys/bus/usb/drivers/usb_8dev
echo "1-1:1.0" > unbind

You will find a file called something similar to "1-1:1.0" in /sys/bus/usb/drivers/usb_8dev so just do a ls to get the correct file and then exchange "1-1:1.0" for this value.

Also don't forget to set sudo chmod -R -v 777 ./ to the driver(ex. usb_8dev) folder.

Also recommended: Disconnect and reconnect ttyUSB0 programmatically in Linux

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