How to extract save from Monster dragón tactic Card?

[CALENTADASTCG]

I have a chinese versión of This Game, nearly completes. I tried to dump the save with megamemory Card but didn recognize the cartridge. Maybe the save is protected or It be in strange format? backup the save gbrxcart but i dont know if It works. I put the 32 kb option. If It is the right save dump, i could share to all. Anyone can help me?