i really need help, i have just got an iphone 3g 16gig, had it jailbroken & unlocked! updated it not knowing it would block my phone! managed to get it back running on 02 but now it is running on 4.0.2 and is really slow, cant cope with it!!!! had it jailbroken again and unlocked, can i downgrade it to 3.2.2 and if so HOW??? and will it block my phone again or loose my unlock??? it was jailbroken with cydia!!! please help i dont know the first thing about iphones or software or anything!!!xxxxxxx