Iphone 3G unlocked software 4.0 downgrade to 3.13?

[Je$$tc@]

i have an iphone 3G that is unlocked but running 4.0 software and it's pretty slow. can i downgrade without relocking it or losing my jailbreak? i think snowbreeze jailbreaks it in the process right?

[Cool_Rock_DuDe]

hey , if you have SHSH saved for your 3.1.3 then you can go back to 3.1.3, http://www.youtube.com/watch?v=F2VWzLOQ51s&feature=related check out this link and the ones following it on the sides , or just wait for a month or two ......apple will be releasing the 4.1.....it is gonna the fix the 3g performance issue