Hi, i'm using iphone 2g. Initially i installed OS 3.1.2(for 2g). Then i changed my mind and decided to restore it to OS 3.01 (for 2g). After that, tried to jb with both redsn0w and blackra1n, but it doesnt work. for blackra1n, it keeps showing the screen where there is an usb cable and itunes. What happened? how can i fix this?