Then it's proof that your DS' been flashed.

Hold down select when powering on your DS to go to the usual nintendo health warning welcome screen, and select pictochat from there.

I don't think the version matters tho. Nintendo doesn't make any forced updates for the DS at all, unlike PSP. So whatever flashed version on your DS is fine, I guess. Besides, you can always upgrade your flashed firmware anytime you want. Just load the update file on your flashcart and execute it from your DS (usually it should automatically detect the update file and asks if you want to update, when you power on)