: Ensure the file you are using is a full dump.
Not all ROM dumps are created equal. If someone used a faulty backup tool or a dirty cartridge, the resulting .nds file might be incomplete. The header of the ROM says DSi binaries exist, but the data structure is corrupted. This is often called a "bad dump." : Ensure the file you are using is a full dump
The error message you are encountering typically appears when using TWiLight Menu++ nds-bootstrap : Ensure the file you are using is a full dump
Why "better"? The error message is essentially saying the current ROM is inferior (corrupt/missing data). A clean ROM is superior (complete/verified). : Ensure the file you are using is a full dump