How to Remove Cydia:
- Connect your iPhone with the computer and backup all your contents , data , contacts , music , videos and images using iTunes Backup feature .
- Now click on Restore button .
- Itunes will connect with Apple Online Store and search for latest update . If there is any new iOS update available it will download the required files and re-install a fresh copy of the OS overwriting all instances of the jailbroken OS .
- After the Restore is complete , your iPhone will reboot .
- Install the previous backup (Step 1) . Your iPhone is now jailbreak free .