Mac? Use PwnageTool
Windows? Use Sn0wbreeze
Grab your 4.3.3 ipsw from here
Grab TinyUmbrella (Mac) (Windows)
Open TinyUmbrella, click advanced, and check "set hosts to Cydia on exit", close it, and restart iTunes.
Click simple mode in PwnageTool or Sn0wbreeze.
SYNC WITH ITUNES!!!
After...