The process can vary slightly depending on the model and the specific issue you're facing, but here's a general guide. Note that Samsung has rebranded its printer line under HP, so you might also find references to these models in HP documentation.
Guide to Firmware Reset for Samsung ML-2160 and ML-2165 Series firmware reset samsung ml 2160 2165 2160w 2165w link
Firmware Version: Crucial for choosing the correct fix file. Firmware Reset Process: The process can vary slightly
: Turn off and unplug the device for at least 11 minutes to fully drain the capacitor and clear temporary memory. Farbtoner.com GmbH 3. Firmware Update & "Fix" Links firmware reset samsung ml 2160 2165 2160w 2165w link
Stable Power: Ensure your computer and printer won't lose power during the 2-minute process.