This is the handshake. On the L6190, you must power off the printer, then hold a specific combination of buttons (usually "Stop" + "Power") while connecting the USB cable. The LCD screen goes dark or displays a cryptic "S" code. The printer is now in a privileged state.
Restores the printer to its factory internal state. Epson L6190 Resetter Adjustment Program
The (often called a "resetter") is a specialized utility used to maintenance internal printer settings, most commonly to reset the Waste Ink Pad counter when it reaches its limit . Core Functions This is the handshake