I inherited a laptop but unfortunately without passwords.
How can I flatten?
Reinstall the operating system
My condolences to you.
If it has Windows 10 then try to reset the pw. If it doesn't work, simply reset the device.
Do you want to scrap this thing because you don't have a password?
You sometimes say "make it flat" when you mean how to reset / format it.
Reset to default
Download the ISO, play it on the stick and reinstall the operating system
Use the trick with utilman.exe