I have the epic 4g touch with sprint and I am waiting to recieve the OTA ICS update. It is rooted and I am running "Calkulins.E4GT.ROM.v2.8.1". When i Recieve the notification to update, if I ever do, what do i need to do or can I just update. I heard it would unroot but will it erase all data like when having to flash a new rom? 