Open Safari, click the Bookmarks icon, select the Bonjour list, and choose your speaker.
However, most Pioneer DJ "S" series controllers (like the SB3, SR2, SS2) are and operate via driver software integration (Serato DJ, Rekordbox, etc.) rather than requiring traditional "firmware updates" in the same way a mixer or media player would. Pioneer-x-smc3-s-firmware-update