For unsigned drivers (CH340, older Prolific):
If you must communicate with the device urgently, boot Ubuntu from a USB drive. Linux’s built-in serial drivers (cdc_acm, pl2303, ftdi_sio) often work when Windows fails. You can use screen or minicom to test. Usb Serial Controller D Driver Download
Plug your USB-to-serial adapter back in. Device Manager should now show the correct name (e.g., “Prolific USB-to-Serial Comm Port” or “USB Serial Port (COM3)”). For unsigned drivers (CH340, older Prolific): If you
When you see in Device Manager, it represents a generic label Windows assigns to a Universal Asynchronous Receiver-Transmitter (UART) or USB-to-serial bridge chip that hasn’t been properly identified. For unsigned drivers (CH340