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Aug 18, 2015 8:43 AM in response to Dubefaceby lllaass,This
If you lost or forgot your firmware password - Apple Support
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If you can't remember the firmware password for your Mac, schedule a service appointment with an Apple Retail Store or Apple Authorized Service Provider. Bring your proof of purchase (original receipt or invoice) with you. If you plan to visit an Apple Retail Store, make a reservation (available only in some countries).
However, since you are not the original purchaser Apple may not help since it is likely the Mac was stolen or lost. Make a reservation at an Apple store and discuss it with them.
For the future note that this is the Mac Pro desktop forum