It will remove all the data ,contacts and apps that you installed
Switch off the handset.
Now navigate to Settings -> Backup & reset -> Factory Data Reset -> Reset Phone.
Then choose option option "Erase everything", and confirm that.
Power off the device.
Next hold and press Volume Up + Volume Down + Power button until you see menu.
In this menu choose option Recovery using Volume Down to navigate, and Volume Up.
* If Volume Up doesn't work, then use Power button to select.
Now you will see yellow triangle and Android logo.
Then press Volume Down + Volume Up to see menu.
Please use Volume buttons to browse option "wipe data / factory reset", and confirm that using Power button.
Select option "Yes -- delete all user data".
After that accept "reboot system now".
Sony Xperia SP c5303 Restore Factory Hard Reset Format Phone.So lets start the Sony Xperia SP c5303 Restore Factory, Sony Xperia SP c5303 Hard Reset.Turn Off the mobile phone for few mints.Sony Xperia SP c5303 Remove Pattern Lock.
Restore Hard reset will set your phone in origional factorry settings. It will remove all the data and apps that you installed. Your contacts will be removed and you have to add them again.