RB450G (3.23) working for many years like a charm as vpn,
What is procedure to upgrade routeros and firmware
[admin@server4] /system> routerboard print
routerboard: yes
model: "450G"
serial-number: "***********"
current-firmware: "2.20"
upgrade-firmware: "2.20"
[admin@server4] /system> license print
software-id: "TW07-DTT"
upgradable-to: v4.x
nlevel: 4
features: