Can a rooted phone upgrade to ICS?

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http://androidforums.com – Sorry if this question has been asked, I did try searching the net a bit before asking. I have a rooted Attrix 4G and I was wondering if I am able to upgrade to ICS. Do I need to unroot before I upgrade? The thing is I purchased the phone rooted so I dont know what method the person used when rooting so if I have to unroot, I have no idea where to start. Thanks in advance =) (General)