Just some helpful tips for iPhone users like me
- Open iTunes & Connect your iPhone to your Mac/PC.
- Press & Hold Sleep/Wake Button & Home Button at the same time
- Release Sleep/Wake Button as soon as the iPhone screen goes blank.
- Continue pressing the Home Button until iTunes prompt you that it has detected an iPhone in recovery mode.
- in iTunes, click Restore
- Click Restore & Update
- iTunes will now restore & update your iPhone
- iTunes will let you know once it’s done, just click OK.