Right. ..last time:
If you get "Resource busy" then something is still interfering and you need to fully kill CommCenter. You may think it's not running just because the keyboard becomes responsive but that is not the full picture.
Either kill the corresponding process or boot-up with CommCenter disabled. Then you WILL NOT GET "Resource busy".
The only other thing I can suggest, for those who are getting "Waiting for data" is to try these files: http://lpahome.com/geohot/112otb.rar