Why do you think it will revert back to sn0wbreeze if you restore? It will not revert you have to use a custom ipsw/firmware and do a Shift(Windows) or Option(Mac) + Restore for Sn0wbreeze so unless you were planning to do that again which wouldn't make any sense all you have to do is hook up the iPhone and his restore. If you end up with a boot loop where it wont get past the Apple logo just put the phone in DFU mode and open iTunes it will tell you the phone is in recovery just click restore.