I did the ireb thing. I attached my iphone 3G 3.01 to iTunes. I cancelled the request to update via Apple. I did the shift restore thing, and used a custom ipsw from a reliable source. Then I restored from a backup that was done a few minutes before the update/restore. I now have 3.2.1 and still have the tethering thing, but no Cydia. I also used pkgbackup. Help, please. How do I get Cydia back and restore my packages with pkgbackup?