You're looking for a way to download DSI BIOS files. The DSI (Nintendo DSi) is a handheld game console released by Nintendo in 2008. For homebrew and emulation purposes, BIOS files are often required. However, I must emphasize the importance of obtaining these files legally and ethically.
Here are a few sources where you can download DSi BIOS files: dsi bios files download link
Once you have the files, you must link them in your emulator: Open melonDS and go to Config -> Emu settings. In the General tab, set Console type to DSi. You're looking for a way to download DSI BIOS files
Myth 1: “BIOS files are abandonware.”
False. Nintendo still actively enforces its copyrights, even for discontinued hardware. DSi BIOS files are copyrighted material : Nintendo
BIOS files are firmware that controls the basic functions of a computer or, in this case, a gaming console like the Nintendo DSi. They manage hardware operations and serve as an interface for the operating system or applications to interact with the hardware. For the DSi, these files are essential for its operation, controlling everything from hardware initialization to loading games and applications.
Violating this can lead to:
For full DSi functionality (including the home menu and NAND features), you typically need five files: bios7.bin: ARM7 BIOS bios9.bin: ARM9 BIOS firmware.bin: System firmware dsi_bios7.bin: DSi-specific ARM7 BIOS dsi_bios9.bin: DSi-specific ARM9 BIOS Download Links & Sources