Mayumi v4 chip wont play stealth games

So, I soldered this chip on my pal 7502 psx model. Originals and normal cd-r boot fine.
Although , stealth games give me problems.
So far I tried Dino Crisis and Crash team racing (both pal versions ) . Dino Crisis won't get past the first warning screen , crash goes to load the first level but hangs on the loading screen.
Tried various isos but the problem remains . I have to follow a specific procedure for these games to run? Wanted to test other stealth games , but run out of cd-r discs :-D

 

PAL copies have libcrypt not antimod!
They are two different protections.
For Libcrypt games the only solutions are dump the iso with subchanels FROM YOUR ORIGINAL BACKUP or apply a patch.