Hi. I have STM32F207 board. I connected and programmed it with STLinkv2 successfully. It worked fine with the example projects. Then for overwriting bootloader I wrote the flash location starting from 0x08000000 where the bootloader resides. After this I can not connect to board. I tried to pull BOOT0 pin to high but it didnt work. It seems bricked. How can I recover it?