Even with the driver installed, some SB2 units ship with firmware that only speaks "Serato." You need the to enable Rekordbox performance mode.
Here is the unvarnished truth about drivers, kernel extensions, and why your SB2 might be a brick—or how to bring it back to life. ddj-sb2 rekordbox driver mac
Why? Apple killed and moved to DEXTs (Driver Extensions) . Pioneer never rewrote the SB2 driver as a DEXT. Even with the driver installed, some SB2 units
Visit the AlphaTheta Community Forums or search for "DDJ-SB2 Rekordbox Mac driver issues." Even with the driver installed