To place the iPhone into restoration mode so you are able to do an iTunes firmware repair practice these steps:

Step One
Open iTunes and attach the iPhone to your Mac.

Step Two
Press and hold the Home button and the Sleep/Wake button at the same time.

Step Three
As soon as
the screen goes black release the Sleep/Wake button. Continue holding the home button until you iTunes pops up a message telling you that it has detected an iPhone in recovery mode.

The iPhone will look like this:

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