Updating your printer’s internal software can provide several benefits:
Press and hold the button for about 5 seconds until the status LED flashes. Release the button to print a Configuration Report . Firmware Samsung ML 2850 --
Downloaded firmware usually comes in a compressed .zip or .7z file. as it can cause permanent damage.
Samsung ML-2850 Laser Printer series Software and Driver Downloads | HP® Support. Software and Drivers. Firmware Samsung ML 2850 --
Samsung ML-2851ND Printer Firmware 1.01.15.50 - Softpedia Drivers
Turn off the printer. Hold the Stop button while turning the power back on. The LED should stay lit or change color, indicating it's ready.
A DOS-like window will appear and show the progress. Do not turn off the printer during this time, as it can cause permanent damage.