System vs BMP Bootloader ======================== For the BMP bootloader, flashing was not reliable. So we use the system bootloder unconditional. Connections: ==================== PA0: User button to force system bootloader entry with reset PA2/PA3 eventual connected to the STLINK/ STM32F103C8 PC2: TDI PC4: TMS/SWDIO PC5: TCK/SWCLK PC6: TDO/TRACESWO PC1: TRST PC8: SRST PD15/Blue Led: Indicator that system bootloader is entered via BMP Bootstrapping the F4Discovery on-board ST-Link ============================================== http://embdev.net/articles/STM_Discovery_as_Black_Magic_Probe has some hints how to modify the F4Discovery on-board ST-Link. If you try to do so and hit a problem that stands some test like that you load the right firmware to the right device via the right BMP probe, explain, report and ask on the blackmagic mailing list http://sourceforge.net/mail/?group_id=407419.