Windows sometimes assigns COM numbers above 10, which legacy QFIL versions hate.
Sometimes Windows prevents QFIL from "grabbing" the COM port due to permission restrictions. Right-click the file. Select Run as Administrator . 💡 Pro Tips for a Successful Flash qfil failed to open com port handle
Before clicking "Download" in QFIL, check your PC's recognition of the device. Open (Win + X). Expand the Ports (COM & LPT) section. Look for Qualcomm HS-USB QDLoader 9008 (COMXX) . Windows sometimes assigns COM numbers above 10, which