i pretty much have the same issue, i softmodded my wii "at store" i'm kind of a noob in that manner, so i didn't try doing anything myself otherwise i might risk the wii and i can't afford getting a new one atm!
anyway i accidentally updated the homebrew and now it's a blank channel, however everything else seems to work fine and the channel where i run copied games is still there and functions fine, now i bought a new game a month ago and found out it requires an update but i wouldn't dare!
my question is, is it possible to upgrade my mod "at store of course" from that point? and what are the chances for me to lose the saved data or brick the wii?
i'd like to point out my mod is outdated as there are already updated mods like NeoGamma!