Upgrade from 3.1.2 to 4.0.1 !
 

Hi guys,
I have two questions, first I have a jailbreaked Iphone 3GS with IOS 3.1.2 and I want to upgrade to IOS 4.0.1 without going through that whole process ( upg. to 4.2 then downg. to 4.1 ! ) is that still possible?
Second how can I save shsh on sydia and why would I need to do that ?


Thanks in advance