Beeping sound when turning on Octopus Pro 446 while trying to flash it

So im trying to flash my Octopus Pro446 i only have Power for the board and usb c to pi plugged in. as soon as i trun it on the board starts beeping and nothing happens. i set the stepper jumpers to 48v and 24v and i have not connected anything to the stepper terminal power wise. i use a 32gb sd card.