I have read and searched a bit about DS roms and the possibility of bricking the DS with a bad rom. Is there a tool to check the Rom if it is ok? My New Flashcart that I bought Used has a few game currently on it and why not keep them to try for a bit. I just worry that one of these could be bad.
Very unlikely, however if you want to try to cover the small chance, get NDS Tokyo trim, this has a basic rom checker withing the program.