Unable to connect (& hence flash the firmware) the STM32-Cube-Programmer with STM32-target-board in USB-DFU-mode if loaded firmware is read-protected.

[nirav soni]

1) I am able to connect the STM32-Cube-Programmer in USB-DFU-mode if existing or loaded firmware in to STM32-target-board is not read-protected.

Image-1: Able to connect with target board

Image-2: Able to load firmware in to target board

2) I am not able to connect the STM32-Cube-Programmer in USB-DFU-mode if existing or loaded firmware in to STM32-target-board is read-protected.

Image-3: Not even able to connect with target board

In this case I am keep getting the DFU connection error,

How to resolve this application bug.

Programmer seems to be not professionally viable,

Has anyone in community found resolution to this application bug.

Can anybody in STM comment?

[SBone.3]

Hi, i opened another thread about this topic, also providing them USB traces to debug the issue but i haven't received an answer yet.

https://community.st.com/s/question/0D53W00001ddlkLSAQ/bug-stm32cubeprogrammer-usb-connection-to-stm32-bootloader-device-fails

you can try to comment there as well, to solicit them for a response..