*https://www.freebsd.org/releases/11.4R/installation/#upgrade

*¼Â»Ü¤·¤¿¼ê½ç
 freebsd-update upgrade -r 11.4-RELEASE
 freebsd-update install
 reboot
 freebsd-update install
 portupgrade -f --config --recursive
 portupgrade -fa
 reboot
 freebsd-update install
 reboot