already told million of times, you dont like searching right? ok if you change your NDS backup media and save again you will corrupt your save file and with the actual version you dont need to have firmware or bios only some rare games still use it, you just need to start the cartridge directly. and also if you want the bios or firmware just dump from your DS because is illegal to get it.
Can you also give more info what the message say, and also what save type are you using?