ROM means "read only memory" meaning you can not write to it. So, no.
ROM stands for READ ONLY MEMORY. Therefore, it is not possible to write to it.
You can write saves to dsiware with a9lh. How do think the hacked save is injected to dsiware downgrade?Can you write a save to dsiware on the 3ds, if you can, is there any software you can?
it would be possible, but yeah if there is no tool to do it yet, it's just because of that - someone hasn't made it yet.Is there any 3ds software that allows you to do this, because I have only seen software to load saves to gamecarts
that doesn't really matter for you about what the guy above said because you asked about carts not dsiware, anyway of course we need hacks to do custom stuff.I have full access to arm9