Drivers are part of macOS (IOStorageFamily). No manual installation. If missing, reinstall macOS combo update.

The Broadcom USH driver is rarely listed under that exact name on manufacturer websites. Instead, it is usually bundled inside a "security" or "chipset" package. How to Fix Dell Broadcom USH Driver Problems

This document clarifies what “Broadcom USH” is, provides the correct drivers, and resolves the “no driver found” error in Device Manager.