Open a command prompt window on your PC (ADB interface) and type the following commands, pressing Enter after each: adb devices adb shell su setprop sys.usb.config diag,adb Use code with caution.
| Problem | Safe Solution | |---------|----------------| | QCN corrupted | Use (Qualcomm Product Support Tools) from Qualcomm’s official site + your own backup | | IMEI = 0 after flash | Reflash stock firmware (including persist partition) from manufacturer | | Baseband unknown | Flash correct modem firmware for your exact model | | Phone blacklisted (bought used) | Request carrier to remove block with proof of purchase – not IMEI tools |
However, with great power comes great responsibility. These tools operate at the deepest hardware levels of your device, and mistakes can lead to permanent damage. Always backup existing data, follow documented procedures carefully, and—most importantly—use these tools only for legitimate repair of your own devices with their original IMEI numbers.
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The tools and methods detailed above are intended strictly for repairing corrupted network configurations and restoring a device's after a technical failure.
Maintain at least a 50% charge to prevent the phone from shutting down mid-process.
Always use a custom recovery (like TWRP) or an ADB tool to backup your phone's current EFS , Modemst1 , and Modemst2 partitions before making any modifications. Step-by-Step Guide: How to Restore an IMEI Using QPST/QFIL Imei Qcn Tool Download
What or network symptom is the phone currently displaying?
: Usually a lightweight, portable application that doesn't require complex installation. How to Download and Use the Tool 1. Prerequisites Before downloading, ensure you have the following:
is the official suite of tools provided by Qualcomm for device management, diagnostics, and flashing. It is the most essential software for any advanced repair work on Qualcomm-based devices. Open a command prompt window on your PC
(Note: The exact command to trigger "Diag Mode" varies by manufacturer. Some devices use dialer codes like *#*#717717#*#* ) Step 2: Verify PC Connection Open the on your Windows PC. Look under the Ports (COM & LPT) section.
Click on in the top menu and select Software Download .
Some versions of the tool let you type in your and IMEI 2 . Always use a custom recovery (like TWRP) or
: Rewrite the network data to fix "No Service" or "Emergency Calls Only" issues.