Installer problems

Hi people, i´m having huge problems with installer and iphone 1.2, i´ve upgraded from 1.1 without problems, and everything was fine, but yesterday i´ve started having problems, i can´t start installer, always take me back to the home screen, so i decided to uninstall it by ssh, and now, i can´t install it, i´ve tried all versions, but no one works always take me back to home screen, if anyaone can help me, could be great, i´ve tried to install it with jailbreakme, and nothing works.


Thanks.