Steps to reset counter on Samsung ML-2510 printers

You have to change the fuse:

The fuse is 250mAh and 3/4" inch long (20 mm) round glass with metal ends. The electrical contacts are not in the cartridge but inside the printer

There is a plastic fuse holder on the cartridge, even the starter cartridge. You just simply pop it into the holder. This will stop the flashing red LED and the system tray will say the cartridge is full.