Manual on “/system routerboard” section… where I can find more informations?
Tnx 
what explanations you need for these entries?
/system routerboard print
routerboard: yes
model: “433AH”
serial-number: “000000000000”
current-firmware: “2.19”
upgrade-firmware: “2.19”
routerboard: yes — if this is routerboard (yes|no)
model: “433AH” — model of the routerboard if it is routerboard
serial-number: “000000000000” — serial number if this is routerboard
current-firmware: “2.19” — RouterBOOT version that is installed on the router, independent from RouterOS version
upgrade-firmware: “2.19” — if RouterOS have newer RouterBOOT available, it will be shown here as upgrade firmware, if you have installed older version of RouterOS, then older version will be available. issuing /system routerboard upgrade command will install version that is mentioned in this field
Additional settings managed from routerboard command,
system routerboard settings> print
baud-rate: 115200
boot-delay: 2s
boot-device: nand-if-fail-then-ethernet
enter-setup-on: any-key
cpu-frequency: 300MHz
boot-protocol: bootp
enable-jumper-reset: yes
I assume all the settings are self-explanatory.