I just did the complete restore with itunes with 4.2.1. then I went through the process in greenpoison, it kept on saying " Try Again"

How do you still restore within redsnow and greenpoison? I have no problem jailbreaking the Iphone 4 or the 3GS. Just this 3G giving me problems. thanks

I need help jailbreaking my iphone 3G. I try using redsn0w, it get stuck in "waiting to reboot" then I tried greenpois0n. it keep on saying to try again.