If you are on Windows 10 or 11, these drivers often lack digital signatures. You may need to restart Windows in "Disable Driver Signature Enforcement" mode to ensure they install correctly. Uninstall Old Drivers:
Configures the COM serial interface used by servicing tools when a Qualcomm phone is connected in EDL mode.
If you are using a very modern flagship (released after 2023), you might require a newer driver version (e.g., v2.0 or higher) to support the latest chipsets. Safety Reminder
Integration with system services
Ensure your OS isn't silently blocking the MTK Preloader digital certificate signatures. qcommtk-driver-setup-1.4.08
: Compatible with Windows 7, 8, 10, and 11 (both 32-bit and 64-bit architectures). Auto-Installation
Using tools like QFIL (Qualcomm Flash Image Loader) to manually install official software.
| Problem | Possible Solution | | :--- | :--- | | | Use the correct USB cable and port. Try a high-quality USB cable. If using a desktop PC, connect to a USB port directly on the back of the motherboard . Avoid USB 3.0 ports (often blue); if recognized, try USB 2.0 ports instead. | | | Reinstall the driver. Uninstall the driver from Device Manager, restart your PC, and run the installer as administrator again. | | | Check for driver conflicts. Look for any yellow warning icons in "Ports (COM & LPT)" or "Universal Serial Bus controllers" in Device Manager. Right-click and "Uninstall device" for any conflicting drivers, then reinstall. | | "Windows cannot verify the publisher..." Error | Disable Driver Signature Enforcement. As detailed in the pre-installation section above, this is the primary fix for this error on Windows 8, 10, and 11. | | Phone in EDL Mode Shows as 'QHSUSB_DLOAD' | Manually install the driver. If Windows doesn't automatically install the driver for a device in 9008 mode, open Device Manager, right-click on the unknown QHSUSB_DLOAD device, select "Update driver" -> "Browse my computer..." -> "Let me pick..." -> "Have Disk..." and manually point it to the folder where your driver is located. | | Error: "A service installation section in this INF is invalid." | Corrupted or incomplete driver files. Re-download the driver package from a reliable source. Ensure you have extracted all files from the archive before running the installer. | | 'Preloader' Port Keeps Disappearing | Try a different USB port and cable. A faulty connection can cause the MediaTek Preloader port to drop out. Also, ensure your phone's battery has enough charge. | | Flashing Tool Fails to Recognize COM Port | Run flashing tools as administrator. Always right-click on the flashing software's executable and select "Run as administrator". This gives it the necessary access to communicate with the driver and COM port. |
: Some older chipsets struggle with USB 3.0 (blue) ports. Try a USB 2.0 port if the connection drops. If you are on Windows 10 or 11,
Before proceeding with installation, ensure your system meets these specifications:
Look under "Ports (COM & LPT)." You should see . Troubleshooting Common Issues
To capture radio logs:
| Symptom | Likely Cause | Solution | |---------|--------------|----------| | Device shows "Unknown USB device" | Corrupt driver or power cycle | Reinstall driver, use a different USB port, restart PC. | | QFIL fails with "Sahara protocol error" | Incorrect driver version for EDL | Use only QDLoader 9008 , not Diag port. Try version 1.4.08 specifically. | | Driver installs but no COM port appears | Device not in correct mode | Enter EDL mode by shorting test points or using EDL cable. | | Windows refuses to install *.sys file | Driver signature enforcement | Disable signature enforcement as described above. | | Port appears but disconnects after 10 seconds | Loose USB connection or power saving | Disable USB selective suspend in Power Options > Advanced. | If you are using a very modern flagship
To verify the drivers have been installed correctly:
Follow the on-screen prompts (usually clicking "Next" and "Install"). 3. Disabling Driver Signature Enforcement (Optional)
An MTK connection will briefly pop up as MediaTek Preloader USB VCOM (COMxx) before disappearing. This cycle is completely normal behavior for MediaTek flashing cycles.
– If the installer fails:
Are you installing this for a , or are you setting up a developer environment ? Audio Developer Resources | Hardware, Software - Qualcomm