I know you said me that (about sending to FFE). But I didn't have time for testing it a lot and I prefered examining it more.
I wrote to FFE about problems with my ORIGINAL Mario Kart (sure if I talk about ROM files they don't reply me) and they DON'T KNOW english properly. In my messages only a part were answered.
Furthermore, I had no money then for sending back to FFE (I spent all my money on it (and customs wanted my last cents ;)).
With I just wrote I mean that I couldn't rely on FFE about fixing it (remember that not only me had the problems) and sending me it back.
Btw, thanks again, The Dumper, for your opinions and advices.
By the way, I'll get a 7 in 1 cartridge shipped from Ecuador to Spain (USA cart). Is it interested to be dumped? If so, I'll do it for sure :)