yeah so i got this working after a few months of trying to get it to work from internal here is how i done it
---COD MW2 ---
) Download the PKG SOLO or Multi
2) Install PKG ( copy SOLO or Multi pkg to your usb and insert in PS3 and install the pakage)
3) Remove default.self , default_mp.self , game USRDIR !!! very important !
4) Use your Backup Manager ( mine was mm 01.13.01) to copy the modified USRDIR folder to your ps3 /hdd0/MW2_GAME
5) If MW2_GAME does not exists, just creat MW2_GAME folder with CAPS
6) After copy, go back to xmb and click on the modern warfare 2 icon
7) Play the game !
*8) You can switch from solo to multi and back by just reinstalling the corresponding pkg, with this method you can play both
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i moved all files to a diffrent location on the hhd then installed the pkg below
EP0002-BLES00354_00-CODWAWMAPPACK105-A0107-V0100-PE.pkg .... then moved the W@W folders back to GAMES
then it worked
you always have to have a GAME in the drive