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Connect your phone to the PC via a USB cable. Open an ADB command window on your computer and execute the following commands to trigger Diag Mode: adb shell su setprop sys.usb.config diag,adb Use code with caution.

: The QCN file you downloaded might not match your precise device variant (e.g., trying to flash an international variant QCN onto a US carrier-locked variant). Always source a specific sub-model QCN file. IMEI Still Showing Null or 000000 Imei Qcn Tool Download

Before downloading and launching any QCN software, ensure you have completed the following steps to prevent permanent bricking: Connect your phone to the PC via a USB cable