I upped my slim from original 3.60 to 3.60 M33 then to 3.71 M33 and extracted the Slims .prx es and that did not work, MapThis starts but the GPS cant load (USBacc.prx).
I havent upped my Fat PSPs to 3.71 and tried to get those .prx files, is that what you did??
I think meny people will be confused of wich unit (Fat or Slim) to extract things from soon :D