Unrooting Galaxy Y

STEPS--
1) Download the unroot-update.zip file here - here
2) Now copy this unroot-update.zip file in your phone's SD Card(not inside any folder)
3) Switch off your device and restart it into recovery mode using the following keys Volume UP + Home Button + Power Button
4) You will find your phone in recovery mode with blue coloured User Interface. You cannot use touchscreen in recovery mode.
For making selections and movements, you have to make use of volume up/down keys and make the selection by pressing home key.
5) In the recovery mode menu, there is an option 'apply update from sdcard' Select it.
6) Choose unroot.zip.
7) After this, you will be back to the menu, and there it's written "reboot system now". Select it.
8) After the reboot, go to phone's main menu and superuser app will not be there.If you are able to find the "SuperUser" App click it and you will notice that it doesn't work anymore, (You can verify it by opening any rooting needed app like Chainfire3D)

Well guys now that you have finally unrooted your phone Samsung Galaxy Y, it will now be impossible for you to run the HD games