Please help Samsung A700FD Model

hello everyone my friend have samsung a700fd variant its current firmware is 4.4.4 kitkat and he wanted to update to 6.0.1 firmware but doesn't update by saying "Your device have been modified, Software updates are not available". but i when i go to the settings the device status is "Official".
the Phone is second hand.

Please help me how i can solve this problem and reply soon

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