Writes network calibration data back to the device.
Download a clean factory QCN backup specifically created for your phone's exact model variant (e.g., international vs. regional carrier variants). Write Fail / Access Denied
: Flash the modified file back to the device using the "Restore QCN" function in QFIL or similar tools.
Sometimes, losing QCN data is a symptom of having the wrong firmware installed. Tungtata’s SamFwTool can fix this: tungtata qcn toolzip install
The Complete Guide to Tungtata QCN Tool: Download, Installation, and IMEI Repair
: Ensure your phone is properly rooted and that the Diagnostic port didn't automatically close. Check if the QCN file you are using is corrupted or meant for a different phone variant. Clean EFS First
Always back up your original QCN file. Corrupting this file can lead to a permanent loss of cellular signal. Writes network calibration data back to the device
: Change or fix invalid IMEI numbers by editing the backup file.
⚠️ Modifying QCN files and IMEI information is a sensitive process. Always create a backup of your original EFS and QCN partitions before making changes. Using an incorrect QCN file from a different model can result in a permanent loss of signal or a "hard brick" state.
: Translates standard 15-digit decimal IMEI strings directly into Hexadecimal formatting and vice versa. Write Fail / Access Denied : Flash the
Compatible with a wide range of devices using Snapdragon processors. 📥 Installation Guide
Note: Watch your phone screen and grant Superuser/Magisk permissions when prompted. Step 2: Verify Device Connection Open the Windows ( devmgmt.msc ). Expand the Ports (COM & LPT) section.
: Changing an IMEI number to an unauthorized value or cloning another active device's IMEI is illegal in many jurisdictions. Only use this tool to restore your device's original, legally assigned factory numbers.
: The tool is released as open-source software with no associated fees or ads. Installation & Setup Guide Since the tool is distributed as a compressed archive ( Tungtata QCN Tool.zip ), follow these steps for installation: Google Drive Download the Archive : Obtain the Tungtata QCN Tool.zip from a reputable source like the official Tungtata Blog Google Drive Extract Files
Once completed, restart your smartphone. Your network bars and IMEI information should be fully restored. Important Safety and Legal Warning Modifying network calibration files carries risks.