So, I downgraded my iPhone 2G to iPhone OS 1.1.1 (it can't run 1.0), and now I'm stuck on the "Activate iPhone" screen. I have a valid AT&T SIM inserted, but when I plug this iPhone into a Mac with the latest iTunes installed, I get a message saying that an invalid response was received from the device. So, I'll probably have to jailbreak the device. What software will I need to jailbreak this device? I found some methods that worked by getting into the Phone app, and then Safari, and then jailbreakme.com, but that website no longer works, so, I need an alternative way.