These are instructions on how to Restore the QCN file on Qualcomm Devices using the QFIL Flash Tool.

Requirements: You need to have a Qualcomm Device to restore the QCN File. Restoring QCN will not work on the devices having Chipset other than Qualcomm.

Restore QCN File on Qualcomm Devices

  1. Download and install Qualcomm USB Driver on the Computer. If in case Qualcomm Drivers are already installed on the computer, then SKIP this step.
    2. usb logo
  2. Download and install QPST Tool on the Computer. If in case QPST Tool is already installed on the computer, then SKIP this step.
    3. QPST Setup
  3. Launch the QFIL Tool (auto-installs with the QPST Tool) from the Start Menu or through the C:\Program Files (x86)\Qualcomm\QPST\bin Folder:
    4. QFIL QPST Folder
  4. Once the QFIL Tool is launched, you will be able to see the following window:
    5. QFIL Tool Launched
  5. Enable Developer Options on your device. To Enable Developer Options: Open Settings > About Phone > Tap on the Built Number/MIUI Version for 6-8 times until developers option is enabled.
    6. Xiaomi About MiUi
  6. Enable USB Debugging on your device. To Enable USB Debugging: Open Settings > Developer Options > Tap on the USB Debugging checkbox to Enable it.
    7. Xiaomi Developers Option
  7. Enable Diag Mode on your device. To Enable Diag Mode: Dial *#*#13491#*#* or *#*#717717#*#* or *#*#717717#*# and Tap on the Diag,Serial_SMD,RMNET_BAM,ADB option and then Tap on the OK button.
    8. Diag Menu
  8. Connect the Device to the Computer using the USB cable.
    9. Mobile Connected Computer
  9. In QFIL Tool, Click on the Select Port button:
    10. QFIL Select Port
  10. Select the Port and Click on the OK button:
    11. QFIL Select Port OK
  11. Click on the Tools menu and Select QCN Backup Restore option.
    12. QFIL Tools Menu
  12. Under QCN Backup Restore, Click on the Browse button and Locate the QCN file on the Computer (assuming you have already downloaded the QCN file or taken the QCN Backup):
    13. QCN backup Restore Browse QFIl Select QCN
  13. Click on the Restore QCN Button:
    14. QFIl Restore QCN
  14. Restoring process will begin and may take a few seconds to complete.
    15. QFIL QCN Restoring
  15. Once the Restore process is completed, you will be able to see the Restore Succeed message on the tool.
    16. QFIL QCN Restore Success

    Congratulations! You just learned to restore the QCN File on the Qualcomm Devices.

    Notes

    [*] The above can be used to restore the QCN file on Xiaomi, Vivo, Oppo, ZTE, OnePlus, and other devices having Qualcomm Chipset.

    [*] Enabling Diag Mode: Above we have shared three codes, i.e., *#*#13491#*#*, *#*#717717#*#*, and *#*#717717#*#. These three codes can be used on Xiaomi Devices to Enable the Diag Mode. To Enable Diag Mode, you may have to enter the correct Diag Mode code; for example, if you have Vivo devices, you have to Dial *#558# in Step#7 to Enable the Diag Mode.

    [*] Credits: QPST Tool is created and distributed by Qualcomm Mobility Inc. So, full credit goes to them for sharing the tool for free.