PizzaCannibal

I play Fire Emblem Sacred Stones (Europe) on an Emulator (JohnGBA) on Android, and there are 2 moments in the game where it freezes: - when I try to use the Arena in the Chapter where you find Ines on Eirika's route (Ch 10 I think) - in the Tower of Valni, at the end of the third floor: if I chose to stop there nothing is wrong, but when I chose to continue the Tower, the games instantly freezes. I've tried in multiple save slots and this problem is located in all of them, so I think the issue is related to the ROM. Is there a way to "repair" the ROM (with a patch or something like that) ? I don't care about the Arena issue, but the Valni one is annoying because I wanna do the Creature Campaign.