Need Help Badly on Phone System Info

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http://forum.xda-developers.com – Is there a way to know the phone's system info (hardware and software) through IMEI? The reason I ask is that there is no "Settings-About.." on these phone except when it boots it reads "Samsung Galaxy Note II". Also, the IMEI printed on the back doesn't match when I type the code *#06#. I tried to set to factory default as per the forum (Vol-up + home + power) but didn't work. If there is any link that will guide me step-by-step to upgrade/re-flash or whatever to restore this phone to a descent one will be highly appreciated. By the way, it is bought by a friend (HowTos)