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A
Araleb
Associate
September 5, 2025
Solved

NUCLEO-WB05KZ target stops responding after flashing firmware (ST-LINK errors)

  • September 5, 2025
  • 2 replies
  • 709 views

Hello, @STTwo-32 

I am working with the NUCLEO-WB05KZ (MB1801 + MB2032B target). I received two boards from the ST eStore.

  • One board works fine: STM32CubeProgrammer detects the target, and I can erase/flash/debug with no issue.

  • The second board initially connected once, but after flashing a BLE firmware example via STM32CubeIDE, the target MCU no longer responds.

Symptoms:

  • ST-LINK is enumerated correctly in Windows (Virtual COM Port visible, target voltage ≈ 3.28 V).

  • In STM32CubeProgrammer:

    • “No STM32 target found” or

    • “ST-LINK error (DEV_TARGET_CMD_ERR)”

  • Cannot connect even when selecting SWD + Hardware reset, lowering SWD frequency, or holding RESET while connecting.

  • Tried with BOOT0 jumper set to “Bootloader” and with “User Flash,” no success.

  • ST-LINK firmware is up to date.

  • Jumpers are in default positions: JP1=5V_STLK, JP2=ON, SW1=3V3.

What I already tried:

  • Multiple USB cables and ports.

  • “Connect under reset” procedure (RESET held while connecting).

  • STM32CubeProgrammer CLI with -c port=SWD mode=UR reset=HWrst freq=1000 -e all → still fails.

  • Verified my second board works with the same setup, so the PC, drivers, and CubeProgrammer are OK.

Questions:

  1. Could the firmware I flashed have permanently disabled SWD (e.g., via Option Bytes)?

  2. Is there another recovery method to force a full chip erase?

  3. If not, should I treat this board as defective and request an RMA from ST eStore?

Thank you in advance for your guidance.

Best answer by STTwo-32

Hello @Araleb and welcome to the ST Community.

To connect to your NUCLEO-WB05KZ, you should follow those steps:

  1. Fit a jumper between the two upper pins of the JP1 on the MB2032 (on bootloader mood).
  2. Open the STM32CubeProgrammer V2.20.0.
  3. Connect the board to your PC.
  4. Set the boot mood to UART, the parity to None, the baudrate to 115200 and the correct COM port: STTwo32_4-1757065342494.png
  5. Click on the Connect button (you may need to click on the reset button).
  6. After connection established, click on the Mass erase button:

     

    STTwo32_5-1757065562221.png

     

  7. (optional) If that didn't work, check the read unprotected option before step 5 and click on the Connect button that should perform a Mass erase: 

     

    STTwo32_9-1757065857121.png
     
     

    Best Regards.

    STTwo-32

 

2 replies

STTwo-32
STTwo-32Best answer
Technical Moderator
September 5, 2025

Hello @Araleb and welcome to the ST Community.

To connect to your NUCLEO-WB05KZ, you should follow those steps:

  1. Fit a jumper between the two upper pins of the JP1 on the MB2032 (on bootloader mood).
  2. Open the STM32CubeProgrammer V2.20.0.
  3. Connect the board to your PC.
  4. Set the boot mood to UART, the parity to None, the baudrate to 115200 and the correct COM port: STTwo32_4-1757065342494.png
  5. Click on the Connect button (you may need to click on the reset button).
  6. After connection established, click on the Mass erase button:

     

    STTwo32_5-1757065562221.png

     

  7. (optional) If that didn't work, check the read unprotected option before step 5 and click on the Connect button that should perform a Mass erase: 

     

    STTwo32_9-1757065857121.png
     
     

    Best Regards.

    STTwo-32

 

A
AralebAuthor
Associate
September 7, 2025

Thanks so much, it works perfect.
Please note that before erasing, one must return to ST-LINK PORT: SWD 

Araleb_0-1757225176396.png

Additionally, I would like to upload BLE_p2pServer in debug mode, but it does not appear to be working. What shall I do to upload and play with it to adapt it to my requirements?

Thanks in advance for your kind support

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