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

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

It's most likely because Windows security features prevent unsigned drivers from running on MediaTek devices if you're seeing the "Unable to open COM port" or yellow driver warning. To fully fix the problem and successfully install MediaTek drivers, adhere to this detailed tutorial.

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✅ Step-by-Step Fix

🔐 Step 1: Open Windows Security

• Press Windows + I to open Settings.
• Go to Privacy & Security > Windows Security > Open Windows Security.

🛡️ Step 2: Click on Device Security
⚙️ Step 3: Click on "Core Isolation Details"

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❌ Step 4: Turn Off Memory Integrity

• Disable Memory Integrity by toggling it off.
• You may need to restart your PC to apply changes.

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🚫 Step 5: Turn Off Kernel-mode Hardware-enforced Stack Protection
🔒 Step 6: Turn Off Local Security Authority Protection
⚠️ Step 7: Disable Driver Signature Enforcement (Enable Test Mode)

Open Command Prompt as Administrator and run:

bcdedit /set TESTSIGNING ON

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• This enables Test Mode, allowing unsigned drivers to install.
• Reboot your PC to activate Test Mode.
• To disable Test Mode later, use:

bcdedit /set TESTSIGNING OFF

🔄 Step 8: Reboot Your PC Again
📥 Step 9: Install the Latest MediaTek Drivers

• Ensure you're using the latest drivers from a trusted source.
• Windows should no longer block the installation.

🎉 Final Result

All MediaTek driver errors — including yellow driver icon or COM port errors — should now be resolved. You can now connect and flash MediaTek devices without issue.