

If it is already on, then you can restart it. My computer is still in great condition and until yesterday, I could run all programs and web browsers just fine. Select your device in iTunes and click on Summary. com Press and hold the power button to shut down your Mac. When you see the boot-screen, press and hold down Command + S keys at the same time. While they might not work for everyone now experiencing the installation error, they are still worth trying.Make sure your computer is on a network that isn't restricting access to certain documented Apple hosts. Hold the Command + S keys while it turns on for a few seconds. Before updating the firmware, make sure the power management settings so that your computer will not automatically turn off the screen or turn into standby mode.

Here’s what you need to do: Open iTunes on your PC/Mac.
