Modify gba roms to flash on bootleg and save batteryless

Strider14

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I recently discovered that i can replace my gba 369in1 cartridge's games by using GBABF tool on the ds lite to flash other games instead those listed in the cartridge's menu. The included games initialy can save batteryless, but the major problem is that when you flash a new game on this bootleg, it can't save. I couldn't identify the save type of the cartridge and i can't save during playing the games i flashed on it. Can someone help me to find out how to modify gba roms like Castlevania, metroid and pokemon so they can save progress ? Or, is there a place where i can find these games already patched for this kind of batteryless bootleg ?
 

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Strider14

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In fact, this cart contains all pokemon and mario's gba games and they all save during game. I guess, the roms installed on this cart are somehow modded so they can save batteryless. That's why i wanted to modify other games to flash them instead of those installed
 

zfreeman

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BennVenn: https://bennvenn.myshopify.com/pages/flash-cart-faq

Bootleg carts won't save unless a battery is fitted. This is becoming rare. Instead, games are modified to use the Flash ROM area as a save area. Many games have had patches made for them to enable saving without a battery. They are called Batteryless save patches. You can ask in our Batteryless saves discord channel for patches or you can try apply similar patches to your ROM - if they're all based on the same original ROM (Fire red, ruby etc) there's a good chance they'll work.

 
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