If QPST does not see your device, check Windows Device Manager. If a yellow exclamation mark shows next to the Qualcomm device, disable driver signature enforcement in Windows and reinstall the Qualcomm USB drivers.
The Vivo V9 is powered by a Qualcomm Snapdragon 626 chipset. Qualcomm devices store critical network configuration data, including calibration metrics and IMEI numbers, inside a protected storage area known as the Non-Volatile (NV) items or QCN (Qualcomm Calibration Network).
The Vivo V9 is a popular mid-range smartphone powered by the Qualcomm Snapdragon 626 chipset. Like any Android device, its cellular connectivity relies entirely on a valid International Mobile Equipment Identity (IMEI) number. If your Vivo V9 displays "IMEI Null," "0000000000000," or fails to register on any network after a bad firmware flash, a corrupted software update, or an interrupted factory reset, your device's NVRAM/QCN partition is likely damaged. vivo v9 imei repair original file by gsmmafia com
: Installs the Qualcomm HS-USB QDLoader 9008 interface driver.
| Error | Solution | |-------|----------| | “QCN is corrupted” | Redownload the file directly from gsmmafia com, ensure no antivirus edits the .qcn. | | “No DIAG port after reboot” | Re-enable Serial Port via Engineer menu. Some custom ROMs disable DIAG permanently. | | IMEI writes but reverts to null after reboot | You need to also flash the from stock firmware (available on GSMmafia). | | Phone goes to EDL mode automatically | Hold Vol+ & Vol- before connecting USB to stay in DIAG mode. | If QPST does not see your device, check
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If the PC does not show the Qualcomm Diagnostic port, reinstall the Qualcomm USB drivers, restart your PC, and try an alternative USB port (preferably a USB 2.0 port on the back of the motherboard). If your Vivo V9 displays "IMEI Null," "0000000000000,"
Windows 10 or 11 (64-bit) is highly recommended.
Fixing a lost IMEI on a Vivo V9 is a necessary skill for mobile repair technicians. The combination of an "original file" from a repository like gsmmafia com and a reliable restoration tool like QPST provides a clear pathway to recovery. By carefully following this guide, you can diagnose the issue, prepare your phone, and execute the repair to bring your device back to full working order, restoring its network connectivity and original identity.
In the section, browse and select your modified Vivo_V9_Fixed.qcn file.