Luukwa

We did check all the cables, but its not showing anything on the screen, also we're unable to calibrate the device. It says the printhead is 750 degrees but its cold to the touch.. we also switched the sensor cables around but that does not seem to back a difference..

Hi! We have a ultimaker original, with a added heatedbed (i think this makes it a + version?) but after the latest firmware update the screen turned blank without any text. I would like to downgrade the firmware to an older version to see if that makes any difference, but i cannot find it anywhere? What should we do to get back into printing? Thanks in advance! Sincerly, Luuk