If your Boca give you the error of BOOTLOADER 3, this will article will help you fix that.
Please proceed with defaulting the printer settings. With the printer powered off hold down the TEST button and then power up the printer. Keep the TEST button held down for 10 seconds and release (the printer will reset at this time). Please note that if a Static IP Address is being used it will need to be reprogrammed after this step as it will be reset back to the factory settings.
Verify there is nothing jamming the MENU button which sometimes may trigger the BOOTLOADER 3.
If the above recommendation don’t resolve the issue then you are dealing with a faulty main board.