Flash Optimus M?

I have an old Optimus M from Metro that I no longer use. My brother has a prepaid Verizon flip-phone (it's sad. lol) I want to give him my Optimus and figured I could easily flash it over to Verizon prepaid service. I'm not having much luck finding out how to do this. Is it possible? And if so, does anyone know how? I flashed my Sprint Evo over to Metro really easily and so I figured this would be about this same, but I am just not finding any info about it. Just wondering if anyone out there has done this...