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GameBoy Flash Carts (sorted by vendor)
Catskull
BennVenn
• BennVenn Charlie 802 2MB / 4MB / 8MB, FRAM
• BennVenn ElCheapoSD v2.2
insideGadgets
• insideGadgets 2MB, 128KB SRAM
• insideGadgets 2MB, 32KB FRAM
• insideGadgets 4MB, 128KB SRAM
• insideGadgets 64MB, 128KB SRAM
J.Rodrigo
• J.Rodrigo 2MB / 4 MB, 32KB FRAM
Kitsch-Bent
• KitschKart Multicart 2MB (BennVenn)
Krikzz
• Krikzz EverDrive-GB X3 / X5 / X7
Nintendo
Professor Abrasive
• Professor Abrasive Drag'N'Derp 3MB, 128KB SRAM
?
• GB USB 64M Smart Card
• Jack DIY
Clone carts
Gameboy Advance Flash Carts (sorted by vendor)
GBA games can use 3 different save types - SRAM, Flash or EEPROM and some cartridges aren't able to support all of these types.
EZ-Flash
• EZ-Flash Omega
insideGadgets
• insideGadgets GBA 32MB, 512Kbit Flash Save
• insideGadgets GBA 32MB, 1Mbit Flash Save
Krikzz
• Krikzz EverDrive-GBA X5
Misc
• Supercard Mini SD
• Flash2Advance
Clone carts
Most clone carts only come with SRAM, sometimes without a battery. If your game saves to an EEPROM or Flash then it won’t work on unless you patch it to use SRAM, the GBATA program seems to work well for this as reported by some users. If the cart you have doesn’t have a spot for a battery, then you will need to patch that game to save back to the flash. Check what save type your game uses here.