Read up on some earlier posts which spoke about removing (un-installing) a couple of apps - which come as a result of running Unrevoked - and rebooting the device. Result -> back to un-rooted device. I assume this applies to an older version of Unrevoked. I used Unrevoked 3.21. It rooted my device without wiping the existing data. But if at all I wish to unroot, I guess there is only one option - reinstall an official ROM. The "Superuser Permissions" app does NOT have an un-install option. Or - is there another way? Thanks!