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.
The latest official firmware, such as version 1.01.15.50, is available through HP Support or third-party repositories like Softpedia . Firmware Samsung ML 2850 --
The printer will automatically restart once the process is complete. Samsung ML-2850 Laser Printer series - HP Support Turn off the printer
Updating your printer’s internal software can provide several benefits: such as version 1.01.15.50