Bought two slim line psp's and three games and cant multiplay

[simso]

Hey folks. I just bought two brand new slimline psp consoles which run version 3.8. I also bought three games so we could multiplay in the house. But it appears to multiplay on both machines we must have the game in both machines, is this right, if so that blows big time.

I tried to use the umddump files to copy the game across onto the memory stick of the other machine and it all appears fine but when I execute the umddump file through the psp it saids corrupt data, so doesnt even attempt to copy the file. I just want to be able to play the same games on both machines in multiplayer mode what do I have to do.

Any help would be greatly appreciated