Visit the regional Pioneer Support Hub or local service hubs. Search for the exact model: X-SMC3-S . Access the dedicated sub-menus.
Compare the published code revision against your recorded on-screen system value. pioneerxsmc3sfirmwareupdate top
Maybe the keyword is for a different model: "Pioneer XS-MC3S" could be a misspelling of "Pioneer X-SMC3S". I think it's likely the same. Visit the regional Pioneer Support Hub or local service hubs