I’ve done some searching, but most links are dead or point to Dell’s old Windows 7 drivers.
The "Broadcom USH" in the Dell Latitude E6420 is not a standard peripheral but a critical security backplane. Resolving the "Unknown Device" error requires understanding that it is part of the ecosystem. By ensuring the TPM is enabled in the BIOS and installing the correct ControlVault driver package, full functionality of the security hub—including smart card readers and fingerprint sensors—can be restored.
. This problem typically surfaces after a fresh operating system reinstallation, as native Windows updates frequently fail to identify and install this specific security hardware package automatically. Understanding Broadcom USH on the Dell E6420
