Vivo Y71 QCN File Repair IMEI Original Network Unlock

VIVO Y71 QCN File helps you repair the network, iMEi, and unlock locked or restricted Networks in a few clicks. I have shared a guide with you on downloading, installing, and using the Vivo Y71 QCN.

What is QCNFile?

A QCN file (Qualcomm Calibration Network file) is a binary file used by Qualcomm-based phones, containing essential network calibration data such as IMEI, RF parameters, and NV items. This data helps maintain stable and efficient network connectivity for cellular, Wi-Fi, and Bluetooth functions, ensuring the best performance for your device.

Functions of QCN Files

  1. IMEI Restore: QCN files are useful for fixing invalid or corrupted IMEI numbers, especially after flashing or firmware updates that cause network or IMEI issues.
  2. Network Calibration: QCN files include calibration data that ensures a stable network connection, preserving essential network settings for smooth operation.
  3. Backup & Restore: You can use QCN files to back up network settings. If settings are lost, restoring the QCN file will automatically recover them without manual recalibration.
  4. Repair & Troubleshooting: If your device has weak network connectivity or fails to connect, a QCN file can restore or adjust network parameters. Always back up the original QCN file before making changes, as incorrect modifications can worsen connectivity issues.

VIVO Y71 QCN File Download Latest Version

Below are the download links for all versions of the Flash tool for Windows (32-bit or 64-bit).

Last updated: Oct 29, 2024
Developer: Vivo
Version: –
Size: 23KB
File Password: a2gsm.com




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How to Use QCN File

Download Required Software:

  • Install QSPT or QPST on your computer for QCN management.
  • Download UltraEdit or HxD to edit QCN files.

Obtain a Working QCN File:

  • Get a QCN file from a fully functional Vivo Y71 device. This file includes the necessary calibration data.

Edit the QCN File:

  • Open the QCN file in UltraEdit or HxD.
  • Locate the IMEI section (usually starting with “08 8A…”).
  • Use an IMEI converter to enter your actual IMEI and get the corresponding hex output.
  • Replace the existingIMEI in the QCN file with the converted IMEI.
  • Save the edited QCN file.

Connect Your Device to the Computer:

  • Connect the Vivo Y71 via USB.
  • Open QSPT or QPST, go to QPST Configuration and ensure the Qualcomm Diag port (e.g., COM9) is visible. Add it via Device Manager if necessary.

Restore the Modified QCN File:

  • In QPST, go to Start Clients > Software Download.
  • Check Allow phone/file ESN mismatch.
  • Select your modified QCN file.
  • Start the restoration process.

Reboot and Verify:

  • Once restored, reboot your Vivo Y71.
  • Check for network connectivity and verify that calls and mobile data are working.

Disclaimer: “This blog is for learning purposes only. Use it on your device, and don’t use it on someone else’s device without their permission. Make sure to back up your data before using the tool. I am not responsible if you lose data or damage your device.”

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