Reflashed a fake 300 in 1 gba cart

tk9

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Since you said it is 64MB, you can flash Bennvenn's Multicart Menu and Flash Pokemon Unbound on 32-64 with GBABF by Fexean. The menu is downloadable here.
https://bennvenn.myshopify.com/prod...es-sram-save-backorder?variant=39273652158567

BLOCK0 contains the Menu. Flash it on 0-32MB. It has space for a game from 16-32 so you can put something there.
Then flash any empty block from 1-7 on 32-64. Then flash you SRAM patched Pokemon Unbound on 32-64.
No need to hex edit like in the tutorial before flashing. Just flash the blocks then flash your ROM later. Hopefully it's not like the 256MByte where there is 4MByte that can not be flashed(or maybe my card is faulty).
You can also do the same on the menu MetroidManiac posted on this thread.

Also use Flash1M SRAM patcher by bbsan2k.

Your cart is probably the same as 7-in-1 Zelda cart that also has battery and is 64MB so you don't have to worry about the chip. The bennvenn menu is compatible with that cart. Just select the EG00xx the one for the multicart and manually select the sector you're going to flash.
 
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Jayro

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You might need to dump the ROM from a bootleg that already has a batteryless patch applied to it. Another issue you'll face is Pokemon games use dual-banking, and save two copies of the save in 1Mbit of save space. Multiboot carts only have 512Kbit of space, so hence why Pokemon ROMs never save right on them. Honestly, bootlegs are fantastic for everything except Pokemon. Spend good money on a GBA Flash cart that has RTC functionality for your Pokemon games, and then you can use bootlegs for everything else.

Feel free to jump into Bennvenn's Discord server, as we're very helpful and knowledgeable about this stuff, and you'll likely get faster replies there too.
 
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