Factory Reset is our way to go as the end users whenever we face some problems with our devices. If you want to restore iPhone, iPad or iPod touch as a troubleshooting step or just to "renew" it, here are the steps to help you. 
- iOS guide: iPhone Tips and Tricks: Tips to Speed up iOS 7 Powered Devices
Prerequisites to check before you restore iPhone, iPad, iPod touch:
- Make sure that you’ve got the latest version of iTunes.
- The process will erase all the data from your iOS device. Ensure to create a back up of your device to help you restore it back.
- The process will take quite a bit of time. Juice up your device or keep it connected with power.
- Before starting the reset to factory settings, disable Find My iPhone feature if you have it enabled: Go to Settings app > iCloud > Find My iPhone On/Off toggle.
- Read: Fix “Wi-Fi Not Available” Error on iPhone or iPad
How to restore iOS devices:
Here is how to restore iPhone, iPad, or iPod Touch:
- Connect your iOS device to the computer and select it once it appears on the iTunes in the top right corner.
- In the Summary tab, click on the Restore button.
- You will see a prompt confirming if you really want to restore your iOS device to factory settings. Click the Restore button to confirm.
- Once your iOS device is successfully restored to factory settings, it will automatically restart.
- When back on, you will see the Hello. Follow the on-screen instructions to setup your new iOS device. You can also elect to restore it from backup.
Ta da! Yep, it was that simple.
