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| Problem | Solution | | :--- | :--- | | Phone not showing up | Change USB port (use USB 2.0 if possible). Try a different cable. | | Driver signature error | Disable (Windows > Recovery > Advanced Startup > Disable driver signature). | | "Device Descriptor Request Failed" | Uninstall the device from Device Manager, unplug, reboot PC, reconnect. | NOKIA C31 Drivers Download