This OID is RouterOS version not firmware (RouterBOOT).Try: oid("1.3.6.1.4.1.14988.1.1.4.4.0")
> system routerboard print oidYou can get all oids directly from console, just write "print oid" command in the section you are interested in. Or you can snmp walk thru all oids to see if there is anything you can use. No need to ask individually here.
1.3.6.1.4.1.14988.1.1.7.4.0
=
iso.org.dod.internet.private.enterprises.mikrotik.mikrotikExperimentalModule.mtXRouterOs.mtxrSystem.mtxrFirmwareVersion.0