Phones on MTK processors (typically Xiaomi, Poco, Redmi, Vivo, Oppo, Realme, Motorola, Nokia, Alcatel, Techno, ZTE) can be fully backed up woth the use of SP Flash Tool utility. This backup can be ...

This error clearly means that the Flash Tool has issues finding the COM port on which your device is connected. Make sure to run SP Flash Tool as administrator on ...