Looks like marcan has already answered this on the BootMii thread on hackmii.com.
http://hackmii.com/2008/10/bootmii-the-beg...g/#comment-3145
From the link;
"@Deozaan.
Nintendo didn’t block BootMii - they can’t. What they did is block normal BootMii installs, which is fine by me because we...