Hello, Thanks for the reply . my settings are board : STM32F407VGTX DISCOVERY BOARD (old)I downloaded the latest AC6 system workbench from openstm32.org i also installed stlink drivers from here https://www.st.com/en/development-tools/stsw-link009.ht...

I am also using the same. Eclipse-OpenOCD

No..I did not replaced the st-link