I made the mistake of pressing the "restore" button on iTunes, following that I tried restoring some firmware (3.1.3 I think) but it was not the hacktivated version. So, now I'm stuck with the "The SIM card inserted in this iPhone does not appear to be supported" message. I'm guessing I have to restore the hacktivated 3.1.3 version of the firmware (I'd prefer an older OS) and probably some other steps as well, but I can't restore the firmware because of that message. Can anyone help me? BTW, I do not have access to a valid AT&T sim card and the phone is a 3G.