I have a PSP with CFW 3.71 M33-4 and I've "obtained" a few games for it. For some reason, no matter what format/compression I put it on my memory stick, the game just doesn't work. When I compress them into cso's on both the lowest and highest compression values on UMDgen 4 or if I just leave them as iso's, they just wont run. The games which are causing this problem are : NFS: Carbon MGS : Portable Ops + Ratchet and Clank : Size Matters The last one just shows up as corrupted on the memory stick. Could I have just downloaded bad copies or did I do something wrong? Also, I notice that whenever I open up MGS, the image is only 800 MB~ and there are no padding/dummy files but the actual iso is 1.16 GB... Thanks for any replies.