STM32 WB55RG sudden fail

matteoballotta · ‎2025-11-20

I recently noticed that my board was not being flashed with the following error:

No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug Authentication

I tried connecting the board using the STM32CubeProgrammer and while the board is recognized correctly by ST-LINK (the serial number shows up) I still cannot connect the board because of the same error.

When the issues started to occur, I was using my board normally with the usual code running when the board suddenly stopped providing power to the pins.

Connecting the board still shows bicolor LED blinking and the LED 4 is always on which I was told it indicates over currents somewhere on the board.

The board also has this fail.txt file when connected using USB:

The interface firmware FAILED to reset/halt the target MCU

I believe the board might be unrecoverable, but I would like to know if anyone has ever had similar issues, if it's common or what might be the causes.

Thanks in advance.

Andrew Neil · ‎2025-11-20

Welcome to the forum.

You need to give some more details - please see How to write your question to maximize your chances to find a solution.

In particular:

What board are you using?
What CubeProgrammer version, and on what OS?

@matteoballotta wrote:
the board suddenly stopped providing power to the pins..

Please clarify what you mean by this?

Does your code put the CPU to sleep and/or disable/reconfigure the debug pins?