When i go into these channels i get something about updating, is this an update to these or the system. i'm on 4.2u softmod?
It's just an update for those emulators.
It will find it on the network, download it, unzip it, then install it.
May require a hard reset when it asks to reset.
Homebrew apps would never ask to update the wii system (it'd ruin their purpose!)