Sometimes, this error is a "false positive" caused by external patches. If you are using a 3DS and have enabled, the loader may struggle to read the binaries.
Many ROM files found online are "trimmed" to save storage space. The trimming process frequently removes the specific DSi data (binaries) required for the game to boot in DSi mode. The Dsi Binaries Are Missing Please Obtain A Clean Rom
For example, in Pokémon Black and White , having functional DSi binaries grants access to: Sometimes, this error is a "false positive" caused
Re-dump or re-acquire ROM if corrupted
Users often trim ROMs to save SD card space. Standard DS ROMs can be safely trimmed by removing null padding at the end. However, trimming a DSi-enhanced game often removes the DSi binary sector because it resides near the end of the file structure. The trimming process frequently removes the specific DSi
Similarly, old anti-piracy patches (from the late 2000s) often stripped out DSi binaries to force the game to run in standard DS mode. If you apply such a patch to a modern emulator that expects DSi mode, you get the error.
You will almost never see this error on original hardware with a legitimate cartridge. This error belongs to the world of emulation (like DeSmuME, MelonDS, or DraStic) and flashcarts (like the R4, Ace3DS+, or DSTWO). Here is why it occurs: