Download Issues Updating or Restoring iPhone 3Gs,4G,4Gs,5G – Are you unable to update or restore your iPhone? This troubleshooting assistant can help. Verify requirements. Make sure your computer has the following: • USB 2.0 port. • The latest version of iTunes. • Access to a Wi-Fi network. and one of the following operating systems: • Mac OS X version 10.5.8 or later. • Windows 7; Windows Vista; or Windows XP Home or Professional with Service Pack 3 or later. Check USB connections. When updating or restoring, connect iPhone to a USB port that is built into the computer instead of the keyboard or an external USB hub.