This is the hardest part. Epson does not officially release this tool to the public (they want you to pay for service). You must find it from third-party sources.
Most standard adjustment programs require the printer to be in a special mode: Reset Epson L380-l382-l383-l385-l485-l386 Adjustment Program
Sometimes the Adjustment Program crashes or won't detect your printer. Try these fixes: This is the hardest part