i recently bought a nexus one off of ebay and it came unlocked and rooted w superboot. what do i need to do to make this unrooted bc i can not get my phone to update to froyo.i have already wiped and restored to factory settings and still no luck. do i need to delete superboot and other files in my file manager. what do i need to do so its just like i recieved a brand new nexus one from google themselves. i am also on att 3g version if that helps. thanks