Dit heet je wii maagdelijk maken. dit is vrij lastig en kost veel tijd.
hieronder een tutorial (bron wiihacks.com)
download hier eerst het ''clean pakket''
www.wiihacks.com/downloads.php?do=file&id=44&act=down
misschien moet je eerst even een account maken.
hieronder de instructies in het engels.
I've put this guide together with the help of bsmalley23 to help people who want to get their wii back to an unsoftmodded 'virgin' state. Once completed you will have a clean Wii on sys menu 4.1.
Channels are best deleted with AnyTitle Deleter as removing them in data management leaves traces behind and don't use the 'format' option on the wii as this won't delete what you want it to and could cause problems.
===If you have an LU64+ Wii then do not try to downgrade! That means if you bought your Wii this year then do not downgrade!===
A) If you are on system menu lower than 4.1 then the first thing you should do is use waninkokos 4.1 updater, this will get rid of a lot of mods and is the safest way to do it, if you are on sys menu 4.1 already then downgrade to 3.2 first with cios downgrader 1.2 then use wanins updater. DO NOT DO THIS IF YOU BOUGHT YOUR WII THIS YEAR.

If you have preloader/dvdx run NAND Clean and it will go through all the files it's going to delete one at a time and ask you if you want to delete them, say yes to all of them. ONLY RUN THIS AFTER YOU HAVE UPDATED, IT WILL CAUSE PROBLEMS IF YOU HAVEN'T!
C) Next load up AnyTitle Deleter, select IOS36 as the one it should run with and delete any IOS that has a number greater than 200. DO NOT DELETE ANY OTHER IOS WITH IT!
Ca) Bootmii users should now run the installer and select 'uninstall'
D) Still using AnyTitle Deleter go to 'installed channels' and delete any channels that you installed yourself, backup launcher channels, pirate wiiware, etc. Then delete the Homebrew Channel and you are done.
Ik heb dit zelf niet geprobeerd en ben niet verantwoordelijk voor enige schade aan je wii.
VEEL SUCCES!