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Associate II
September 9, 2025
Solved

STEVAL-25R20SA Eval kit won't respond

  • September 9, 2025
  • 2 replies
  • 870 views

Hi, 

Every time I try to connect the eval kit to the GUI I get this error:

This board doesn't reply properly to connect !

Can anyone tell me how to solve this problem.  I have made sure that the correct COM Port and baud rate is selected. Also, the power indicator LED is ON and the RED LED is flashing. 

Your help is greatly appreciated.

Regards,

This topic has been closed for replies.
Best answer by Ulysses HERNIOSUS

Hi,

yes, check the points from Brian. IMO most probable: USB cable: Check it has a USB symbol and not a battery symbol. Verify with a different device that it works.

Ulysses

2 replies

Brian TIDAL
Technical Moderator
September 9, 2025

Hi,

make sure the baud rate is 921600.  Make sure there no other STLink device connected. Try to flash the firmware (click on the Update firmware button on the main tab) in case the flash has been erased or modified. If it is still not working, could you send the content of the logging window?

Rgds

BT

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hfarooquiAuthor
Associate II
September 9, 2025

The content of the logging window is as follows:

0: serEncSysNfcResetReq()

1: serEncSysNfcResetReq()

2: serEncSysNfcResetReq()

3: serEncSysNfcResetReq()

It will not let me update firmware as it doesn't properly connect to the board.

 

hfarooquiAuthor
Associate II
September 9, 2025

The baud rate is sent to 921600 for both COM port and the board

hfarooquiAuthor
Associate II
September 9, 2025

How do I use the STM32CubeProgrammer?

The firmware directory that the GUI is pointing to has nothing in it.

hfarooquiAuthor
Associate II
September 9, 2025

This is what the firmware update screen looks like.

 

Brian TIDAL
Technical Moderator
September 9, 2025

Hi,

when clicking on Scan board in the upgrade firmware window, nothing is displayed? Copy the "FW dir": this contains the binary.

For STM32CubeProgrammer, go on st.com and download the installer. Start STM32CubeProgrammer, click on connect. If you cannot connect, check your USB cable. Open the "FW dir" and load the FW onto the board.

Rgds

BT

 

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.