# QDL device not connected

Source: https://forum.modalai.com/topic/4466/qdl-device-not-connected
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2025-05-28 22:31:38 UTC by will.huang.oksi
Replies: 6 · Views: 1178

## will.huang.oksi · 2025-05-28 22:31:38 UTC

To whom it may concern,

following this instruction to https://docs.modalai.com/voxl2-unbricking/

slide the SW2 switch into the ON position,

![26feb7e9-e497-4cb4-89be-ffeec74306e0-image.png](https://forum.modalai.com/assets/uploads/files/1748471453914-26feb7e9-e497-4cb4-89be-ffeec74306e0-image.png) 

but in QDL Tool, it shows QDL device not connected.

![c3679163-9bb1-4e6d-a8a0-624623e7bf36-image.png](https://forum.modalai.com/assets/uploads/files/1748471264284-c3679163-9bb1-4e6d-a8a0-624623e7bf36-image.png) 

I have confirmed that the USB-C cable works with other VOXL devices.

Any suggestions or anything I missed?

Thank you for your precious time on this.

## Reply by will.huang.oksi · 2025-05-29 17:53:07 UTC

Hello,
if you need any other information for this question,
please don't hesitate to let me know.
Thank you for helping!

## Reply by will.huang.oksi · 2025-05-30 17:21:33 UTC (in reply to will.huang.oksi)

Hello ModalAI Team,
If you need any additional information regarding the issue I’m currently experiencing, please don’t hesitate to let me know. 
I appreciate your time and support on this matter.

## Reply by will.huang.oksi · 2025-06-01 22:12:28 UTC (in reply to will.huang.oksi)

Hello ModalAI Team,
Here is the HW and SDK info

  - ModalAI Flight Deck M0054
  - VOXL system image 1.8.02-M0054-14.1a-perf
  - VOXL suite 1.4.1

Thank you.

## Reply by ZuraNeb (ModalAI staff) · 2025-06-02 18:06:40 UTC (in reply to will.huang.oksi)

@will-huang-oksi 

Hello, thank you for your patience. 

Can you run the lsusb command and let us know the output? (As the voxl is plugged in)

## Reply by Nathan Raras (ModalAI staff) · 2025-06-02 18:53:01 UTC (in reply to will.huang.oksi)

Hello @will-huang-oksi,

In response to @ZuraNeb as well, when running "lsusb" in your terminal with the device powered on and connected over USB, you should see the following device:
![Screenshot from 2025-06-02 11-50-13.png](https://forum.modalai.com/assets/uploads/files/1748890353896-screenshot-from-2025-06-02-11-50-13.png) 

If not, I'd recommend filing an RMA and we can further debug the issue: https://www.modalai.com/pages/rma

## Reply by will.huang.oksi · 2025-06-03 16:41:23 UTC (in reply to Nathan Raras)

Hello @Nathan-Raras  and @Nathan-Raras ,

I don't see any Qualcomm device with running "lsusb". 
I also have confirmed that the USB-C cable is able to access another VOXL device.
So I have submitted the RMA
![d45c5737-8bf3-4c8b-9e7d-851acbfe82a8-image.png](https://forum.modalai.com/assets/uploads/files/1748968811422-d45c5737-8bf3-4c8b-9e7d-851acbfe82a8-image.png) 

Please let me know if any questions or suggestions.
Thank you very much for supporting.