Yesterday I updated the firmware to 4.0 on my iphone 3g. After the update I unplugged the usb and used my phone, it seemed a bit sluggish but I thought nothing of this. I put the phone to sleep but the phone would not wake! The only way to make it wake is to reset the device by pressing the sleep/wake + home buttons for ten seconds. I thought that restoring the device may solve these issues but I cannot do this as I keep getting error 1602. I have uninstalled and reinstalled itunes an the twice, created a new account on my mac, tried it on two different windows machines and used different usb cables every time I get an error 1602. I have also tried resetting my phone in settings > general > reset > reset all settings. This has not helped. Any help solving this without going to a mac store would be greatly appreciated!!