How can I erase everything off a MacBook Pro? When it says "Erase Assistant is not supported on this Mac"?

Miranda057 wrote:

How can I erase everything off a MacBook Pro I just bought from someone else? When it says "Erase Assistant is not supported on this Mac"?

if you are having to do this, then it sounds like the machine was not properly prepared for resale.

I hope it works for you

here is your reference—

What to do before you sell, give away, or trade in your Mac follow the instructions as presented:

• If this feature isn't available or doesn't work on your Mac:To reset your Mac to factory settings, which includes erasing your Mac, follow the steps in what to do before you sell, give away, or trade in your Mac.

Use Disk Utility to erase an Intel-based Mac - Apple Support