How to solve "Error: No STM32 target found! If your product embeds Debug Authentication, ..." ?

[AVall.3]

[atillagolan]

Hi :)

It seems the board is locked and there is no way to connect to the board! Is there any way to perform "debug authentication" or discard this by disabling?

[marioP]

Hi everyone!

I was having endless issues like these, and as a last shot I decided to give this video a try. 
STM32 by LowLevel on Youtube 
Going through the steps, and some slight troubleshooting courtesy of ChatGPT made me finally able to connect and upload blink led code!

Hope this helps someone else. 

[Maposaagsky]

- I joined together BOOT0 and VDD pins. i did just like you say

and WORK very nice

tank you very much my frend

now i can recognize and programmer mi customize PCB from the stm32h747BI

[michaellimardi]

Hi i'm facing similar issue, i believe the issue started when i'm trying to erase flash memory. 
I've tried several things according to this forum but it is not working :
1. Press Reset button while connecting to STM32CubeProgramer
2. Connecting Boot0 and VDD and try to connect

3. Using discovery on debug authentication

[EmanuelLibo]

i reinstall st-link server https://www.st.com/en/development-tools/st-link-server.html, the problem resolved

[gm_man]

This happened to me just now when I loaded a pin configuration meant for a STM32F411VET6 to a STM32F411CEU6.

As rubenayl said, connect while holding reset. In my case I had to keep doing this every time I wanted to connect to the chip. What worked for me was doing a "Full chip Erase" using the STM32CubeProgrammer.

[ofer-bahar]

Hello AVall

the problem is this BOOT0 in a wrong state probably due to earlier programming, take a look on this paragraph from the user manual 

So... in the H747-DISCO board you have to

1. unplug the USB ST-LINK

2. unmount the LCD,

3. short R192 - keep it short circuit 

4. plug the USB ST LINK

5. now it boots with BOOT0 = '1'

now you can program, 

after program you can put the LCD back 

Ofer