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Error Flash download failed - "Cortex M4"

Question asked by klaus.daniel on Jul 18, 2014
Latest reply on Jul 22, 2014 by klaus.daniel

I´m doing my bachelor thesis at the moment by designing a hardware with a microcontroller. I´m using a self made board with the STM32F407ZG microcontroller. My board has a JTAG adapter for programming. All the other components which are required for reset an so on are placed in the same way like on the STM32F4 Eval board of ST.  I´m using keil uvision 5 and a Ulink2 adapter.

After I finished my board I tryed to flash it with a programm which is working on an eval-board, but it just worked the first time I tryed it with no errors. Since then I can´t operate anytime with my board. If I try to flash it always brings a timeout error.which says "Flash timeout. Reset the target and try it again".
So my question is if there is a way to set the microcontroller back to the factory settings, by an external setup.

thanks for any help