Maybe. I don't think so though.
I only ask cause i seem to lost my health and safety app on the 3ds, i am not sure how to get it back. my only theory is reflashing firmware since i assume is in there and not in system cnd to just download from server.
I comfirmed that system updates do not reflash entire system, only what is detected out of date, similar to android updates partial and full software updates. I learned something new all by myself.
Even though it cost me a silly mistake.