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: Write the modified QCN file back to the device using the same software used for the backup.
Here is a detailed walkthrough for installing and using a typical QCN toolzip package.
Create a safety backup of your network calibration data.
A healthy backup QCN file specific to your precise phone model. Step 1: Download and Extract the Tool Package
: Windows 7, 8, 10, or 11 (64-bit recommended).
To use the tool effectively for device repair, follow these general steps: Backup QCN:
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If successful, a toast message will confirm that the "Diag USB port" is enabled. Method 2: ADB Command Line (Rooted Devices)
Follow these steps to safely download and set up the tool from a compressed .zip archive. Step 1: Download the ZIP Archive
: If prompted for a password during extraction, use tungtata.net .
Restoring or fixing invalid IMEI numbers that may have been lost during firmware flashing.
Open the tool and click to detect the COM Port.
[Qualcomm Device] ---> Back up QCN via QFIL ---> [Tungtata QCN Tool] (Modify IMEI) | [Qualcomm Device] <--- Restore QCN via QFIL <--------------+ Phase A: Back Up and Export the QCN File