I have 3.52 M33 and all other games I've tried work (Star Wars:RS, Bleach 4, God of War, Spider Man, etc..) However Madden 08 (cso) doesn't work.
The game reads, when I click it the PSP screen comes on, then it goes black and goes back to the XMB screen with the message "The game could not be started (80020148)".
I tried every UMD Mode (the one I always use is Sony np9660), but I still get the same result of black screen the goes back to the XMB with the message I stated in my first post.
If you still can't seem to get it working, you can always try extracing the entire iso contents to a folder, and then start the process of creating a brand new iso from scratch. It may have been a bad dumb. Alternatively, you can always try d/lding again.