Introduction
Go to step 1
Entering DFU Mode (Official Instructions)
1. Plug your device into your computer.
2. Turn off the device.
3. Hold the Power button for 3 seconds.
4. Hold the Home button without releasing the Power button for 10 seconds.
5. Release the Power Button but keep holding the Home button.
6. Keep holding the Home button until you are alerted by iTunes saying that it has detect
Step 1iPhone - 4 / 4S / 5 / 5S / 5c / 6 / 6S - How to flash in DFU mode
ATTENTION, ATTENTION !!! You will lose all your data. Be sure that you have backup.
Open iTunes.
Enter the phone in DFU mode and connect it to the PC