hello, i am using stm32f407. I was working on PWM using timer4. Accidently i connected VDD pin to 10V. Now my stm is downloading program. Every time I press download button it is shownig me thi message "Flash Timeout:Please reset the target and try again." Please help me how to fix this problem.
Sounds like you have physically damaged things, there isn't a software fix or reset button for this. Lacking good diagnostic tools and skills, you might just want to replace the board.