Windows often fails to "see" the driver automatically. You’ll need to point it in the right direction: Device Manager (Right-click Start > Device Manager). QHSUSB_BULK under "Other Devices." Right-click it and select Update Driver Browse my computer for drivers

Userland interface

Without this driver, professional-grade service software cannot establish a handshake with the Qualcomm chipset at a pre-boot level. It is the "key" that unlocks the ability to communicate with the hardware before the Android or primary operating system has even loaded.

The driver acts as a bridge between the Windows operating system and the hardware’s interface. Unlike standard USB Mass Storage or MTP drivers, the Bulk CID driver is designed for: