I got a replacement phone with 4.3.3. Tinyunbrella only saved mine 4.3.5. it is too late to save 4.3.3. the only hope is waiting for iFaith which can save 4.3.3 but iFaith is having an issue and is being fixed.
I already jailbroke mine phone. just be careful not to install unstable apps to avoid messing up the phone and having to restore, which force you to upgrade to 4.3.5.