I am afraid STM32F7508-DK is too poor for the device. The MCU used in it has only 64K of the flash memory inside. It is not enough for the firmware. It is still possible to execute the code from the on-board fast QSPI serial flash, but, anyway, it is several times slower than the internal flash. In all other respects the board is identical to STM32F746G DISCO.
