Nintendo bothered to block 2 other versions that datel released with an MIOS v6 and a v8 already.
i don't think it's that hard.
I didn't have to update at all to have the Wii get ticked when I try to use my GC AR. Straight out of the box, I played one game (didn't update) and then popped in my AR - it rejected it.
And now I find out that I'm going to have to hunt down a different version of the Load-Mii-Shop-Update program, because the one I have doesn't work (freezes in the middle of the process). I was using the one they said was compatible with HBC! Oh well. Maybe there's a more recent version. But until then, I can't use the shop channel, and my Wii Points (those things aren't cheap) are completely useless. Just so long as it's not a well laid trap by ninjas... ;P