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

[AVall.3]

[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