Let me explain.
Your drivekey did block the update, that's why you got the black screen. The game was calling for an IOS which you didn't have so it hung. The update was avoided perfectly.
You changed the region and now the drivekey sees it as 'in region' and will allow the update to be requested.
As previously pondered Regionfrii just changes a few bytes to fool the Wii into thinking it's running an In region game, this also fools your drivekey.Originally Posted by Regionfrii - WikiTemp
If you run the update you will get bricked.