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Syed_Haque
Associate
Oct 13, 2025 2:33 PM UTC
Solved

USB Device no recognized

I have diymore stm32f407vgt6 board , I connect usb  give DEVICE NOT RECOGNIZED  if i try DFU mode BOOT0 >3.3V, BOOT1 > GND, I try  every thing  but nothing . please  help mee

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TDK
TDKBest answer
Oct 15, 2025 7:52 PM UTC

This board has issues.

 

You'd be better off getting a nucleo board with a built-in programmer. Programming over the USB DFU connector is a recipe for disaster and unproductiveness.

 

Especially problematic:

PDR_ON shorted to both 3V3 and GND. (Pictures show both R6 and R7 are fitted.)

TDK_4-1760557675760.png

 

Also:

VDD not tied directly to VDDA.

TDK_3-1760557618075.png

 

ID pin of USB connector not tied to GND.

TDK_2-1760557595946.png

 

VCPA typo in schematic.

TDK_1-1760557577735.png

 

And my favorite, they have a typo in the silkscreen in the company name

TDK_0-1760557547338.png

 

"If you feel a post has answered your question, please click ""Accept as Solution""."
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3 replies

Gyessine
Gyessine
ST Technical Moderator
Oct 13, 2025 3:36 PM UTC

Hello @Syed_Haque , and welcome to the ST Community,

First, you can refer to this article to improve your chances of finding a solution.
Could you provide more details about your schematic and the context of your project?
Gyessine

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question.
    Syed_HaqueAuthor
    Associate
    Oct 15, 2025 5:33 PM UTC

    download (3).jpegdownload (2).jpeg I use stm32f407vgt6 board by DIYMORE  this is schematic. I try to make remote controller EDGETX radio transmitter.  the problem is when i pluged  usb and connect with microcontroller  desktop give warning notification  ( USB device not recognized) and check in device manager> Universal Serial Bus controllers  section showing Unkown USB device(Device descriptor request failed). try many thing and download many driver .still not work

     

     

     

     

     

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     STM32F407VGT6-schematic.png

    TDK
    TDKBest answer
    Oct 15, 2025 7:52 PM UTC

    This board has issues.

     

    You'd be better off getting a nucleo board with a built-in programmer. Programming over the USB DFU connector is a recipe for disaster and unproductiveness.

     

    Especially problematic:

    PDR_ON shorted to both 3V3 and GND. (Pictures show both R6 and R7 are fitted.)

    TDK_4-1760557675760.png

     

    Also:

    VDD not tied directly to VDDA.

    TDK_3-1760557618075.png

     

    ID pin of USB connector not tied to GND.

    TDK_2-1760557595946.png

     

    VCPA typo in schematic.

    TDK_1-1760557577735.png

     

    And my favorite, they have a typo in the silkscreen in the company name

    TDK_0-1760557547338.png

     

    "If you feel a post has answered your question, please click ""Accept as Solution""."
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