To understand why a firmware reset is necessary, you must first understand how the Samsung ML-1860 manages toner.

If the key combination above does not work (common on newer firmware revisions or region-specific models), you need a deeper reset: re-flashing the firmware.

For users trying to clear a "Toner Low" message on some versions of the ML-1860/1660 series: PrinterKnowledgehttps://www.printerknowledge.com Resetting the Samsung-ml1860 | PrinterKnowledge

Leave it unplugged for at least 1–3 minutes to drain the internal memory.

This process clears internal errors and resets page counters to 100% without modifying the firmware itself.