To use this Crestron touch screen, first make sure it's properly connected. When you encounter the issue of not being able to factory - reset because the login blocks the Setup menu, try to check if there are any software glitches. For maintenance, keep the screen clean with a soft, dry cloth. Avoid using abrasive materials. Also, ensure it's placed in a dry and cool environment to prevent damage. If the problem persists, it's recommended to contact Crestron's customer support.