How to change the account of disabled iphone 4s without knowing the original account?

I recently just got an iPhone 4s that was donated but was locked with a pass code and i failed too many times and is now disabled and has the message "IPhone is disabled" now i'm trying to restore the iphone but i can't do that without having the account of the original owner.Is there a way to change the account? Possibly a hacking tool or something of that sort?

Plug your phone in the computer and turn it all the way off.(Slide to Power Off)'
1.Hold down the power button for 3 seconds.
2. Without releasing the power button, start holding the home button with the power button for 10 seconds
3.Release the power button but keep holding the home button until a message pops up on your computer saying the phone needs to be restored.
Then restore it

Hope this helps!