Anyway to unlock an Iphone 3GS with the latest baseband?

I accidently upgraded to the 4.1 software update and reversed my software back to 4.0.1 so that is all okay. I jailbroke my phone but I can’t unlock it due to the 4.1 updating my baseband. I am on 5.14.02 – I tried using Fuzzyband to downgrade the baseband but it will not work. Is there any other way for me to downgrade or unlock my phone so I can use it on another carrier?