UART_YModem_Updater This small .bat file will allow you to update the program of the microcontroller built on the basis of the repository "STM32_F4_YModem_UART_bootloader".

As far as I understand usb_f207.c code, it always inits USB HS in FS mode with internal PHY. But stm32 supports external phy by ULPI interface and if I understand correctly, now it's not implemented ...