Help

I bought a iphone version 1.1.2 in december I downgraded it and jailbreak it, I upgraded it to 1.1.2, jailbreak it and then used turbosim. It worked fine for a month or so but I was having problems with my installer and run anysim 1.2 by mistake. Now my iphone is not jailbreaked anymore. I tried to downgrade it to 1.1.1 and I also tried to jailbreak it qith the jailbreaker for 1.1.2 but it does not works. Does anyone knows what I should try next? I think that I would like to virginize it but I don't know if I can do that through my computer. It would be helpful if you guys could tell me if you know how to access the installer from the emergency numbers. I go to my contact list by dialing *#307# and everything is in there its just that I can't use the main menu does anyone knows how can I access the installer from my contact list?