The way to handle an L4260 reset is to first check if your physical maintenance box is full. If you are tech-savvy and want to clear the digital counter manually, the Adjustment Program is the standard tool. Always remember: if you reset the software without checking the physical pads, you risk ink leaking into the internal components of your printer.
Run the adjustment program as an "Administrator" to give it permission to write to the USB port.
Open the application and click the "Select" button. Choose "L4260" from the model list.