The phone worked great for 3 months then I went to settings to update firmware. Somewhere during the update the phone went haywire and just keep turning on and off. I put the phone in restore mode hooked to i-tunes and did a restore, ( the phone was never hooked to my computer before ,so no backup ). After restore I set country ,language and wifi settings then the phone tries to activate but fails and I can't go beyond that screen. I tried a straight talk sim card ,I tried an active at&t sim and a blank at&t sim but nothing. I downloaded "redsnow" to do a jailbreak but now the phone won't go into DFU mode. It will go into dfu as long as it's not hooked to the computer but as soon as I plug it in ,it turns the phone on. any help would be appreciated, thank you.