Downgrade Apple iPhone 4 (3.10.01) firmware?

I recently used pwnage tool to upgrade my Jailbroken iPhone to 4.3.3 since it was having problems on the older software. However after it finished, it also updated my baseband to 3.10.01. I have saved SHSHs on my computer so is there a way to downgrade the BB or is it permanent? I know I can revert back to old iTunes versions but am not sure about the basebands. Cheers.