Wow, thank you thank you thank you to you and @KaosEngineer! I was getting desperate trying to make this game work...
Couldn't find first chain 00 00 00 00 00 00 00 00 02 02 00 00 01 (nor its replacement 35 38 34 34 34 35 34 36 FF 01 00 C0 07) in the default.xbe but managed to change second one despite HexEdit v4.0 adding two '?' by itself in both Find and Replace field, after fiddling a while to get this '?' to disappear, it works, and now the game starts !
So I noticed you give the same two chains to modify for all three games, what are they doing exactly ?
I still have some 30 games or such not working, some of them are rebooting the console, some of them are freezing it...