i have a iphone 2g. it was jailbreak-ed, recently i Erase All Contents and Settings, The erase process is normal, the logo and the progress bar were
displayed as predicted. but at the end the iphone did not return to its reset state, it repeatedly displays the logo, and can't connect to the itune ( the usb is not work).
now my problem is "Is jailbreak-ed iphone can't do the "Erase All Contents and Settings"operation? and what can i do to regain the USB function and restore the iphone.
I think that your USB ports are working and it's just that iTunes is not recognizing the device. Follow these instructions and your should be able to get it to work:
Hard Reset:
1) Power iPhone on.
2) Hold the Home and Sleep/Wake buttons for about 7 seconds, or until the screen turns black.
3) Your iPhone should reboot. If it doesn't don't worry, just hold the Sleep/Wake button for about 2 seconds.
Forced Restore:
1) Turn iPhone off by holding down the Sleep/Wake Button for about 5 seconds or until the Slide to Power Off slider appears.
2) Slide Power Off slider. If iPhone is unresponsive, follow the Hard Reset instructions up to Step 3.
3) Open iTunes on your computer (Mac or PC).
4) Hold the Home Button down while you connect your iPhone to your computer via a USB cable.
5) iTunes should prompt you with a message saying an iPhone has been detected in Recovery Mode and that you must Restore it to before it can be used with iTunes.
6) Click Ok.
7) Click Restore a message should appear confirming that you want to Restore and Update.
8) Click Restore and Update. The restore has been initiated. Leave your iPhone connected until you iPhone reboots and syncs with iTunes.
David