Pokemon Fire red save error using GBA emulator?

So I downloaded Pokemon Fire Red on my GBA emulator and started the game. I got a nice female charmander and I'd love to keep her. Unfortunately, when I tried to save the game, it gave this error: "save error. Please exchange the backup memory" What should I do now? If I close the game now... show more So I downloaded Pokemon Fire Red on my GBA emulator and started the game.
I got a nice female charmander and I'd love to keep her. Unfortunately, when I tried to save the game, it gave this error:
"save error. Please exchange the backup memory"

What should I do now? If I close the game now I'll lose my female charmander! I've heard changing it from 64K to 128K works but only if I close the game first.
Is there a way to save my game without turning it off?
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