How to put your iPhone into DFU vs Recovery Mode

Recovery Mode is what your iPhone goes into when you are doing a standard iOS upgrade or restore, but you may want to put your iPhone into recovery mode for other reasons (often related to jailbreak).
Recovery Mode is different from DFU mode because DFU mode bypasses the bootloader which allows for things like downgrading firmware. You cannot downgrade firmware with Recovery Mode, you can only upgrade or restore.

I thought it is best to put it down here, as much as for my own archiving and to share with you.

1. Recovery Mode
• Disconnect the USB cable from your iPhone, but leave the other side connected to your Mac or PC
• Launch iTunes
• Press and hold down the Home (that’s the circular one) and Sleep/Power button on the top of the iPhone to turn off the iPhone
• Press and continue to hold the Home button while you reconnect the USB cable to your iPhone, this will cause the iPhone to turn on
• Continue to hold the Home button until an alert message in iTunes informing you that an iPhone in recovery mode has been detected.

2. DFU Mode (In order to restore or downgrade iOS firmware)

DFU means Device Firmware Update. If a restore using Recovery Mode doesn't work you will want to use DFU Mode as a last resort. When placing your iPhone into DFU Mode it does not load the OS before attempting the restore
To put the iPhone into DFU mode so you can do an iTunes firmware restore follow these steps:
• Step One
Open iTunes and connect the iPhone to your PC

• Step Two
Press and hold the Home button (The circular one) and the Sleep/Wake button (Power ON/OFF button) at the same time.

• Step Three
After exactly 10 seconds release the Sleep/Wake button. Continue holding the home button until your iTunes pops up a message telling you that it has detected an iPhone in recovery mode.

3. Exit iPhone Recovery Mode

You can typically exit recovery by doing the following:
• Hold down the home and power button for about 15 seconds, this shuts off the iPhone
• Press the power button to boot the iPhone