Hi, i have a sprint samsung epic touch 4g running 2.3.6 gingerbread rooted. now i am.fairly new to rooting android phones and tbh i.dont realy know what rom i have or anything lol.. all i know is that its rooted . anyway i want to update to ice cream sandwich but idk.if i can do this if i am already rooted. do i have to unroot my phone then root again once upgraded? help is appriciated thanks.