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If the device is showing as "Unknown Device" or "SPRD U2S Diag" with a yellow exclamation mark, follow these steps to install the driver manually: Unisoc | Spreadtrum SPD drivers for Windows (SCI & USB)

and look under "Ports (COM & LPT)" to confirm "SPRD U2S Diag (COM22)" is listed without error symbols. Quectel Forums Are you trying to flash firmware sprd u2s diag -com 22- drivers download

No, the COM port number is dynamically assigned by Windows based on available system resources. As long as the device name shows "SPRD U2S Diag", the specific number is not an issue. If the device is showing as "Unknown Device"

Look for a device labeled , SPRD MCU Device , or Unknown Device with a yellow warning icon. Right-click it and select Update driver . Look for a device labeled , SPRD MCU

Windows operating systems frequently block unsigned virtual COM port drivers. Follow these steps to bypass restrictions and bind the device to COM 22 manually. Step 1: Disable Windows Driver Signature Enforcement