will reinstalling MAC OS allow user to reset password without losing any saved information on MAC?
Will reinstalling MAC OS allow a user to rest password without losing any data?
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If all you want to do to reset your password, see the link below for how it is done.
Change or reset the password of a macOS user account - Apple Support
You do not have to reinstall the OS to do this. Reinstalling an OS does not delete any of your other files unless you elect to reformat the disk, in which case everything is erased.