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mac pro flashed

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    Mac Pro 4,1 upgraded to 5,1 wont boot

    I hope someone can help me with this issue. I have a Mac pro 2009 4,1 that was flashed to 5,1 before i bought it. It has had some issues with kernel panics, sudden crashes, etc, never any indication of what the cause may be. Usually it freezes and then i just do a hard reboot and comes back up...