If you previously updated firmware and want to go back to an older version (sometimes resets all settings):

For Samsung ML-2160 and ML-2165 series printers (including "W" wireless models), a firmware reset is typically performed to bypass the toner chip counter, allowing for cartridge refills without purchasing new OEM chips Pre-Reset Checklist

where the printer fails to recognize a perfectly good compatible cartridge. Step 1: Gather Printer Information

: Hold the Print Screen/WPS button (above the power button) for about 10 seconds until the LED flashes once, then release. Look for the Serial Number and Firmware Version .

Most firmware resets involve a "fix" file specifically generated for your printer's Serial Number and CRUM series. Connect via USB