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Ensure your UMT Dongle is plugged in before launching the software, as it requires hardware validation to open the interface.
Your computer isn't reading the USB dongle. Try a different USB port, clean the gold contact chip on your smartcard, or reinstall the Smart Card drivers in Device Manager. umt gsm 5.2 setup download
Right-click the shortcut on your desktop and choose Run as Administrator . Ensure your UMT Dongle is plugged in before