It is not complicated or difficult to reset any version of iPhone, iPad or iPod that connects with the computer. However, the process of reset will delete all the data and passwords in your phone.
The most obvious reason for resetting is because your iPhone has been disabled due to too many incorrect pass code attempts.
Before you begin; it is important to note that an iDevice (iPad/iPod/iPhone) should not have iCloud activated. This is as security measure to lock down stolen iDevices. If you do reset it with iCloud enabled; you will not be able to login.
Steps to reset a disabled iPhone/iPad/iPod
b) USB data cable
c) The device you like to reset
1. We will start the procedure just by turning the device off. To do that; hold the power button (which is the sleep/wake button) on the top and wait for the “slide to power off” appears; when it does; slide it to power the device off.
2. Now hold the home button; and whilst holding the home button insert the other end of the USB Cable into the charging port on the iDevice. Before you do this; make sure that iTunes is installed on your system and the computer is turned on with one end of the USB already connected to the computer.
3. The iDevice will now start into the DFU mode.
4. Now that iPhone/iDevice is connected to the computer it will automatically notify you and ask you, which of the operation you would like to perform. Click on the “Restore” option.
5. You will be prompted again to confirm the restore. Click on “Restore and Update” option. Once the restart starts; it will then take a few minutes for the restore to finish. After restore has finished; you will see an apple logo on your iDevice with a white slider; let this continue. After it finishes; iPhone/iDevice will start-up and you can set it up again from scratch.