do yourself a favour and don't update, 4.3 is a pain and has no benefit for the user, was only designed to prevent homebrewing and modding etc.
this may sound blunt but to make things easier for you,
you might want to switch to softmodding and usb loading.
no disc burning, and no worries with updates (you would have to use scrubbing software everytime when you get a newer game to remove the update partition so the wii doesn't get updated etc etc)
check out wiiflow on youtube for example.
you'll never get nice coverflow loaders with a hardmod.
plug in your usb harddrive, have every single game in one loader, just so nice
also allows you to play movie dvds, stream music to your wii, play .avi from hdd or shared network folder etc.
still have my old wiikey in my console but my drive didn't see a disc for a long time.
no disc mess, burning, getting mad on bad burns, no scratched discs etc.
do the softmod any wii guide (linked below). takes about 2hrs to get a long, reading, preparation and getting the job done.
good read is also the wrap up on softmodding basics linked below