def METHOD_NAME(vm_name):
    """
    Remove nvram setting for rhel6 guest
    :param vm_name: VM name
    """
    vmxml = vm_xml.VMXML.new_from_inactive_dumpxml(vm_name)
    vmxml.os = libvirt_bios.remove_bootconfig_items_from_vmos(vmxml.os)
    vmxml.sync("--nvram")