You MUST have Kies full installed on the desktop/laptop and make sure you're updated to the latest version.
1) Boot your note into download mode
2) Connect your Note to the laptop with factory USB cable
2) Launch Kies on your desktop (full version)
4) Choose Tools, Firmware upgrade & initialization
a) While in download mode, pull battery and enter the S/N & model name (ALL CAPS!!)
b) It will prompt to initialize to original settings. Click "YES"
c) It will prompt to initialize the latest version. Click "YES"
d) It will download the firmware upgrade components (DO NOT DISCONNECT THE DEVICE!!)
5) It will prompt for firmware upgrade and initialization.
a) Click check box for reading above information
b) Click your choice if you want your information saved on Samsung Kies corporate servers (I choose WITHOUT saving).
Just kick back, wait and the phone will update to the original out of box software with the latest updates already applied. No issue with anything, no tripping of the flash counter, and Samsung/AT&T knows now different (if you tripped the counter back before performing this, or performed the process of installing CWM recovery through ADB as to NOT trip the flash counter when changing recovery).
This is the EXACT process I did, and had an AT&T tech verify and it's not detectable I was rooted, and was running a custom ICS ROM. Now, I will qualify that I DID the Recovery installation with ADB so that I didn't trip the counter with the Recovery installation. So if they are able to check the binary information to detect modification even with flash counter reset, that's out of my hands and can't confirm or deny.
This is ONLY to reset to factory GB Latest & greatest for performing OTA/Kies update of ICS when it's finally released.