So I was given an Envizen 7" tablet (I think it's the 7028D model), but noticed (after installing AVG on it) that it is rooted from the factory. Is there any way I can unroot this, or flash it with another Android OS image (maybe a generic image) so that it's not rooted. normally I wouldn't be concerned, but who knows with all this security stuff in the news going around. I think it was rooted by the manufacturer so they could add their own customizations.
Any ideas? Can I just download an image of Android from the developer's website? It currently has Android 4.1 Jelly bean.