A simple reset via on-screen menus does not exist for the L3250. You must use an (often called a “resetter” or “WIC Reset Utility”). This software connects to your printer via USB and forces the internal counter back to zero. This is the only official way how to reset Epson L3250 using resetter adjustment.
Before running the software, you must prepare the printer hardware. How To Reset Epson L3250 Using Resetter Adjustment