How to bypass recovery Lock screen to upgrade operating system

I purchased a mid-2012 Macbook pro i7 on Ebay which works great except for trying to enter the recovery screen which has a lock needing a code which my seller didn’t provide. Is there anyway to get past this or find the code so I can actually use the computer like it is suppose to be used? Thanks for any help you can provide me

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Do you mean a firmware lock (lock symbol with password box under it) if that is the case nothing can be done to bypass it