Not only is this the only legal method, but it also guarantees you have a perfect, uncorrupted file. You gain the satisfaction of knowing your emulation setup is both authentic and ethical.
If you want to see the classic Nintendo DS "splash screen" and hear the iconic chime when you start a game, you must use the original BIOS files. Nds-bios-arm7.bin
A legitimate nds-bios-arm7.bin is exactly 16,384 bytes (16 KB) . If your file is any larger or smaller, it is corrupted or a fake. Not only is this the only legal method,
The ARM7 processor in a physical DS handles lower-level tasks like sound, Wi-Fi, and input. Without its corresponding BIOS file, many emulators simply won't boot, or they'll lack the stability needed to prevent crashes during gameplay. Recommended BIOS Files - Joey's Retro Handhelds A legitimate nds-bios-arm7