Have you tested it on Rebug? Because I don't think it would work on Rebug.
it work on rebug be you needa make the headers in the t6mp_ps3f.self into eboot then make it boot into zombie beside mp and then u can do it on rebug,then after 24hors if that the eboot gets flag cause its a modded file so if u wanna do zombie go on ps3ita