Used MacBook. No ID or password.

savnsan wrote:

Hi, I just purchased my nephew’s MacBook Pro. Because he loaned it to some jerk who reset everything, I have no way of knowing the ID or password connected with this device. I need to do a factory reset it and reinstall the operating system. I would so appreciate some help. I’ve been working on this for quite a while and it’s above my pay grade. Thanks so much.

Same as here—

What to do before you sell, give away, or trade in your Mac ...

savnsan wrote:

Thanks Leroy, but I can’t log out of any of the apps or programs mentioned in this article. The guy who had possession of my nephews computer treated it as his own and changed everything to his ID and his password. What I’ve been trying tonight is to follow directions to reset to factory settings. I seem to have gotten through the erasing part just fine but I can’t get to the reinstalling of the Mac OS without being asked for the Apple ID attached to the device. I probably did something wrong I’m not sure. Computers are not my forte and I haven’t used a Mac in 20 years. But I can usually follow directions on support pages and get things done. Not in this case.Thanks again.

There are at least 52 models of MBP  released since January 2006— I have no idea what exact Mac you have to drill down on the details.

I can make some guess—

for example:

About Startup Security Utility - Apple Support

for example:

What is a firmware password on Mac? - Apple Support

If you can not reinstall the macOS from Internet Recovery/ and or Recovery you will need to visit an Apple store and show proof of purchase/ownership for an attempt in resolving your issue.

How to reinstall macOS from macOS Recovery - https://support.apple.com/en-us/HT204904

Call your local store and see if you need an appointment...

Make an appointment for a "hardware issue"—

https://www.apple.com/retail/geniusbar/

Call Customer Support  (800) MY–APPLE (800–692–7753)

or on line  https://getsupport.apple.com/

Outside the USA—Contact Apple for support and service by phone

See a list of Apple phone numbers around the world.

https://support.apple.com/en-us/HT201232