Only one application can "hold" the COM port handle at a time. Close the following before running QFIL: MiFlash Tool QPST Configuration ADB or Fastboot command windows PC suites (like Samsung Smart Switch or Sony Companion) 5. Run QFIL as Administrator
: The most common culprit is using incorrect or corrupt Qualcomm USB drivers. Many users find that generic 64-bit QDLoader drivers fail, whereas the drivers included within the QPST installation folder are more reliable. qfil failed to open com port handle
Use the drivers found inside the QPST installation folder rather than generic standalone versions; these are often more stable. Only one application can "hold" the COM port
✅ The most frequent fix is ensuring the device is correctly seen as Qualcomm HS-USB QDLoader 9008 in Device Manager and running QFIL with Administrative privileges while all other serial communication software is closed. If you are still stuck, could you tell me: What phone model are you trying to flash? Does the device show up as 9008 in Device Manager? Are you using a USB 3.0 (blue) or USB 2.0 port? Many users find that generic 64-bit QDLoader drivers