OK i am new to this and am looking for the light at the end of the tunnel. I downloaded rachet and clank size matters for the PSP on utorrent. Put it on my sons PSP and it says it is corrupted. I have searched but am unsure on what i need to do. I see the downgrades and devhook, the problem is i haven't seen where i need to start. The PSP is running 3.11 and has a 2g mem stick.