Pierloha
Newbie
Idk why anyone would want to unroot their phones, cuz I mean rooted phones are so much better. Anyway, there's a very detailed guide written for this on the xda forum, so head over here [FIRMWARE][ICS][GUIDE] Stock 4.1.A.0.562 Greek .:: Only 4 steps, guide! ::. - xda-developers to unroot your device.