the guide fails to mention the uninstallation method, which consists of booting off of a USB pen drive and removing the line that was just added. passworded bio

the guide fails to mention the uninstallation method, which consists of booting off of a USB pen drive and removing the line that was just added. passworded bios? insert the hard drive in another machine instead. this also doubles as the method in which this "security" measure would be defeated.