You seem very knowledgable so how did you make such a mistake?
You are on the iPad baseband you can't use anything and I mean ANYTHING except Pwnage Tool and Sn0wbreeze to upgrade or reload your firmware. So if you still have the 4.3.3 custom firmware you made with Sn0wbreeze put it into DFU mode open iTunes and hold down the Shift button and click restore and point to the ipsw. If you don't have it anymore then just redo the steps in Sn0wbreeze to make another ipsw again, you are unlocked so make sure Sn0wbreeze is in Expert mode and that Activate the phone is checked. If you get any errors then you may need to fix your hosts file search on here for my name and threads I've created, look for the What to do if you can't upgrade using iTunes.
Once you're JBen again go to iClarified - Apple News and Tutorials look in Tutorials, iPhone, Unlock and follow the steps.