flash bootloader

def cmd_flashbootloader(self, args):
        '''flash bootloader'''
        self.master.mav.command_long_send(self.settings.target_system,
                                          0,
                                          mavutil.mavlink.MAV_CMD_FLASH_BOOTLOADER,
                                              0, 0, 0, 0, 0, 290876, 0, 0)