This means you are missing the necessary diagnostic driver. The SPRD U2S Diag Driver
Open . You should see SPRD U2S Diag (COM#) listed under "Ports (COM & LPT)". Troubleshooting Sprd U2s Diag Driver For Windows 10 64 Bit
Troubleshoot > Advanced options > Startup Settings > Restart to "Disable driver signature enforcement". Use Device Manager Device Manager and select your PC name at the top. Action > Add legacy hardware This means you are missing the necessary diagnostic driver