Qusb Bulk Cid Driver

Modern Windows versions block the installation of unsigned drivers by default. Many Qualcomm EDL drivers, especially older or manufacturer‑specific versions, lack a valid digital signature. This results in an error message or the driver simply refusing to install.

The QUSB_BULK_CID entry in Windows Device Manager indicates a Qualcomm-based device has entered Emergency Download Mode (EDL) due to a hard-bricked state or failed firmware update, requiring the installation of the Qualcomm HS-USB QDLoader 9008 driver. Manual driver installation, often requiring disabled driver signature enforcement, allows tools like QPST or MSM Download Tool to restore functionality. For a guided walkthrough on installing these drivers, watch this YouTube tutorial OnePlus Community Fix QHSUSB_BULK brick, on the OPO - OnePlus Community

lsusb -v -d 05c6:9008 | grep "bInterfaceSubClass\|bEndpointAddress" qusb bulk cid driver

What is the exact of the device you are trying to connect?

When Windows displays the "QUSB_BULK_CID" device name, it means the operating system detects the underlying hardware architecture (a Qualcomm chipset) but lacks the specific software package required to talk to the chip’s interface. Why Does a Device Show Up as QUSB_BULK_CID? Modern Windows versions block the installation of unsigned

Host Device (EDL mode) | | |--- USB Bulk OUT (Sahara/Firehose handshake) -->| |<-- USB Bulk IN (ACK, session open) ------------| |--- Bulk OUT (CID read command, e.g., 0x34) --->| |<-- Bulk IN (128-bit CID data) -----------------| |--- Bulk OUT (close session) ------------------>|

Many custom or legacy Qualcomm diagnostic drivers are not digitally signed by Microsoft. The QUSB_BULK_CID entry in Windows Device Manager indicates

Write from userspace:

Select from the category list, then click Next .