Can you go from 3.1.2 to ios4 in one step?

[banksdouble]

I have iphone 3gs new bootrom which is jailbroken and i want to update to ios4 but when i go on i tunes it only has the 3.1.3 update.
can u go straight to ios4 from 3.1.2? ( idont care about it being jailbroken still)
appreciate any help.

 

[jackie treehorn]

are you running iTunes 9.2?