In need to unroot At&t Samsung Galaxy Note i717 and restore phone using Kies

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http://forum.xda-developers.com – I have an rooted At&t phone that is also sim unlocked as I am using Tmobile I have rooted so that I could tmobile while in its 4g area but I don't live in a 3g/4g area so I don't care to have this anymore and want to return back to stock rom it came with and having the most difficult trouble I tried so far about four roms that said to be stock and for the most part are but I still have root access and with that Kies won't allow me to update to ICS and also I need to do a restore from Kies because of some important things that I backed up so any TRUE help that will get me back to being unro (HowTos)