Without knowing WHICH Galaxy Note you have or which update it is on, then it's hard to provide you with the correct guide to fix your issue. But a factory reset didn't help anything because you made a change to the /system and the factory reset wipes /data (except /data/media). It's not Rom Toolbox's fault. You accept the risk whenever you decide to mod your phone. Sucks, but hopefully this will be lesson learned and next time you decide to change something in the system, you should do a nandroid backup. You would have been fixed back up in about 10 minutes if you would have had one.
The guide Riir posted is essentially correct, but the files might change depending on if you have the international, Korean, AT&T, or T-Mobile version or whatever other variants they have of it.
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