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Ithian's guides are the best in the business. So long as you take your time and do exactly as described, you won't brick.
No it isn't the question marks that show cIOSCORP. It is the Rev 65535. Anyway, like I said make a post in Ithians thread and wait for confirmation before doing the guide. Post this link in the guide so ithian can see your syscheck. --- http://www.wiihacks.com/wiihacks-newbie-discussions-forum/60585-help-please-can-you-come-here-look-my-wii-2.html#post377612 ( Don't post the full syscheck just post this link)
EDIT: Or like mentioned above you can do the guide without posting. Again, I know nothing about korean wii's.