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1. Connect
2. Dump
Insert a GB/GBC cartridge into the GBA, connect the link cable, and turn on the GBA. After multiboot, the GBA will switch to GBC mode and verify the cartridge. Then press:
A — Dump ROM only
B — Dump SRAM (save) only
START — Dump both ROM and SRAM
Use "Dump Only" if the GBA is already running the dumper ROM.