How to Fix Unable to Open COM Port Error for MediaTek Drivers on Windows

How to Fix Unable to Open COM Port Error

The “Unable to Open COM Port” error is common when working with mobile flashing tools or serial devices. This issue usually occurs due to driver conflicts, wrong port selection or already-in-use ports. It prevents tools like SP Flash Tool, Miracle or other COM-based utilities from functioning. Understanding the cause is key to resolving it quickly and avoiding data loss. This guide provides a reliable fix for both beginners and professionals.

Key Features: of How to Fix Unable to Open COM Port Error

• Identifies the root cause of the COM port conflict or blockage.

• Works on Windows 7, 8, 10 and 11 operating systems.

• Clears port hang-up issues and driver misconfiguration.

• Helps release COM ports stuck by background processes or tools.

• Involves no third-party software — uses built-in Windows tools.

• Tested method for mobile flashing, dongles and diagnostic tools.

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How to Use: of How to Fix Unable to Open COM Port Error

• Press Win + X > choose Device Manager > expand Ports (COM & LPT).

• Right-click on the port showing error or yellow warning > click Uninstall device.

• Disconnect and reconnect the device to refresh the COM port.

• Go to Task Manager and end any tool or process using the COM port (e.g., adb.exe).

• Reopen your flashing tool and select the correct, refreshed COM port.

• If the issue persists, restart your PC and try a different USB cable or port.

Conclusion:

Fixing the “Unable to Open COM Port” error is simple with the right steps. Most issues stem from port conflicts, driver glitches or active background processes. Following this guide ensures smooth connectivity for your flashing or service tools. Always double-cHow to Fix Unable to Open COM Port Error for MediaTek Drivers on Windowsheck port usage and device manager for proper detection. With this solution, you can confidently resolve COM port errors in minutes.