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It is now well documented that they later bricked a non-trivial fraction of Wiis worldwide, whether they had BootMii or not, when they pushed a dummy bootloader update whose only purpose was to overwrite our installed version (but which unconditionally applied to everyone).
My flasher not only had the two-copy safety that their design called for (but which their updater was not safely implementing), but also included a novel trick to provide *three-copy* atomic safety. Powering down at *any* time during BootMii installation is, in principle, safe.
That one near miss was a bug in this stuff in some corner case Wiis, which ended up corrupting one of the (eventual) main copies. However, my code checked and refused to run if *any* copy was not valid, so the affected user could do no further damage. Their Wii was fine.
All they saw was a first install attempt (I forget if it failed or reported success) that didn't work in practice, followed by all subsequent install attempts failing with a safety check error. After fixing the bug I added even more paranoia to make sure it didn't happen again.
What was the novel trick?
I abuse the way they do bad block lists for the boot area so I can write my patched boot code to free blocks, then in one final write mark the original first copy's blocks as bad so my copy becomes the first copy. Uninstallation then is just erasing that.
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