Unknown Firmware Password prompt after deleting Bootcamp

I bought a MacBook Pro second hand last year. The previous owner installed bootcamp on it and I tried getting rid of it to no avail. When I shut it down and tried to turn it back on I just got the folder with the question mark, presumably a startup disk issue. When I try the reset shortcuts and resetting pram it just shows a firmware password entry, of which I don't know. neither does the precious owner. Ive brought it to the apple store to see what they can do but they said they can't do anything without original proof of purchase. Neither I, nor the original owner has the receipt. So, I have a paperweight that runs and is a password away from working. Help?

Hi Boudewijn,
I personally haven't seent this behavior as of yet. I've done 6 upgraded on the SX300 series and 4 on the SX500 series. The good news is, there is nothing lost if you have the ability to console the unit.
If you console the unit there is a password bypass option
1)Bits per seconds: 115200
Databits: 8
Partiy: None
Stop bits:1
Flow control: None
2) Reboot the switch, just unplug the power and plug it back in
3) When prompted, press ESC
4.) I beleive it is option 6 that is "password recovery"
Once you choose this option, the switch should boot as normal and you may sign in without the admin password.
-Tom
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I was just told by a tech store that my bootcamp partition was slowing down my computer incredibly. I no longer need this partition so I went into Disk Utility, clicked the partition, and deleted it. I also had my RAM updated from 4GB to 8GB. I have an Early 2011 Macbook Pro, operating on Yosemite.
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Unknown Firmware Password prompt after deleting Bootcamp

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