im not so sure if i can ask here or not

hey guys.....need a help on my iphone 4gs.....i've tried to jailbreak my iphone FW 4.0.1 using jalbreakme.com. at first, everything was fine and it was jailbroke, but when i tried to insert the apps, it does not work.
i connect my itunes and it automatically downloaded for me 4.1 and now im having issues to downgrade as im unable to find my SHSH saved file either on my computer or in saurik's...hope you guys can help....

yes i do, but when i need to downgrade, it says something like not authenticate or somehing....cant recall..and i did use Umbrella to get the SHSH file on cydia server but they said, its not available and im too late.....tats the main issue...no SHSH, no downgrade.....damn!...