I am using stm32f429zi discovery board.When I am trying to use SPI peripheral, one bit shift in MOSI is observed with respect to Clock.It is tested in all modes of SPI, still getting the same result in oscilloscope. We are not able to understand this...

During testing, Suddenly HOST PC stop detecting the board saying unknown device. NO VID/PID was recorded also. So, we need to upgrade the firmware again But the ST-Link USB is not working only. Is there any other way to upgrade it. Kindly suggest